Question 1: Palette 1/160

Allen MCQ

During $G_{2}$ - phase a diploid cell contains the amount of DNA equal to a :-

A

Diploid cell

B

Tetraploid cell

C

Haploid cell

D

Hexaploid cell

Question 2: Palette 2/160

Allen MCQ

In which order, cytokinesis occurs in plants:

A

Centripetal

B

Centrifugal

C

Oblique

D

Equatorial

Question 3: Palette 3/160

Allen MCQ

Nuclear envelope reappears at :-

A

Metaphase

B

Prophase

C

Anaphase

D

Telophase

Question 4: Palette 4/160

Allen MCQ

Which does not occurs in prophase?

A

Decondensation of chromatin

B

Condensation of chromatin

C

Appearance of chromosome

D

Disappearance of nuclear membrane and nucleolus

Question 5: Palette 5/160

Allen MCQ

In which stage of cell division, number of chromosomes can be best counted?

A

Prophase

B

Metaphase

C

Telophase

D

Interphase

Question 6: Palette 6/160

Allen MCQ

How many chromosomes shall be present in a diploid cell at mitotic anaphase if ovum of same species has ten chromosomes?

A

10 (Ten)

B

20 (Twenty)

C

30 (Thirty)

D

40 (Forty)

Question 7: Palette 7/160

Allen MCQ

In which stage of mitosis, the chromosomes are composed of two chromatids?

A

Prophase & metaphase

B

Anaphase and telophase

C

Prophase and telophase

D

Metaphase and anaphase

Question 8: Palette 8/160

Allen MCQ

Gap between division phase and start of DNA-replication is called :-

A

$G_{1}$ - phase

B

$G_{2}$ - phase

C

M - phase

D

Interkinesis

Question 9: Palette 9/160

Allen MCQ

During cell division, spindle fibres attach to which part of chromosome?

A

Primary constriction

B

Secondary constriction

C

Telomere

D

Satellite

Question 10: Palette 10/160

Allen MCQ

During which stage a diploid cell becomes tetraploid in mitosis?

A

$G_{2}$

B

Prophase

C

Metaphase

D

Anaphase

Question 11: Palette 11/160

Allen MCQ

Division of centromere occurs in:-

A

Prophase

B

Metaphase

C

Anaphase

D

Telophase

Question 12: Palette 12/160

Allen MCQ

What happens in synthesis phase during cell cycle?

A

DNA replication

B

Chromosome number becomes double

C

Formation of two nuclei

D

Synthesis of tubulin proteins

Question 13: Palette 13/160

Allen MCQ

Reappearance of nucleolus along with thinning & elongation in chromosomes are diagnostic characters for the :-

A

Anaphase

B

Metaphase

C

Interphase

D

Telophase

Question 14: Palette 14/160

Allen MCQ

Condensation of chromosomes and appearance of astral rays occur during :-

A

Prophase

B

Metaphase

C

Anaphase

D

Telophase

Question 15: Palette 15/160

Allen MCQ

Chromosomal morphology (Structure) is best observed at :-

A

Prophase

B

Metaphase

C

Interphase

D

Anaphase

Question 16: Palette 16/160

Allen MCQ

M-phase of cell cycle consist of :—

A

G₁, S and G₂ phase

B

Prophase, Metaphase, Anaphase, Telophase

C

Interphase, Prophase, Metaphase, Anaphase, Telophase

D

Only prophase

Question 17: Palette 17/160

Allen MCQ

If the cell is diploid in $G_{1}$ than after the S phase cell remain/become :-

A

n

B

4n

C

8n

D

2n

Question 18: Palette 18/160

Allen MCQ

Nuclear membrane disappears in :—

A

Late prophase

B

Early prophase

C

Metaphase

D

Telophase

Question 19: Palette 19/160

Allen MCQ

Pre - DNA synthesis phase is:-

A

$G_{1}$ - phase

B

$G_{2}$ - phase

C

S-phase

D

Prophase

Question 20: Palette 20/160

Allen MCQ

How many steps of division will occur in an isolated tip cell to form 128 cells?

A

128

B

127

C

32

D

7

Question 21: Palette 21/160

Allen MCQ

The number of chromatids in a chromosome at $G_{2}$ state of cell cycle will be:-

A

One

B

Two

C

Four

D

Eight

Question 22: Palette 22/160

Allen MCQ

Many cells function properly and divide mitotically even though they do not have :-

A

Plasma membrane

B

Cytoskeleton

C

Mitochondria

D

Plastids

Question 23: Palette 23/160

Allen MCQ

Centromere is required for –

A

Movement of chromosomes towards poles

B

Cytoplasmic cleavage

C

Crossing over

D

Transcription

Question 24: Palette 24/160

Allen MCQ

At which stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

A

During telophase

B

During S-phase

C

During G₂-phase

D

During entire prophase

Question 25: Palette 25/160

Allen MCQ

Prophase which follows the S and $G_{2}$ phases of interphase, is the first stage of :-

A

Meiosis-II

B

Karyokinesis

C

Interphase

D

$G_{1}$ phase

Question 26: Palette 26/160

Allen MCQ

The two asters together with spindle fibres form:-

A

Mitotic apparatus

B

Centromere

C

Astral fibres

D

Centrosome

Question 27: Palette 27/160

Allen MCQ

In prophase centrosome, which had undergone duplication during interphase, begins to move towards :

A

Same pole of the cell

B

Opposite poles of the cell

C

One towards centre while another towards pole

D

Both towards centre

Question 28: Palette 28/160

Allen MCQ

Which of the following not occurs in Anaphase-I but occurs in Anaphase-II:—

A

Condensation of chromosomes

B

Poleward movement of chromosomes

C

Shortening of spindle fibres

D

Splitting of centromere

Question 29: Palette 29/160

Allen MCQ

Crossing over takes place in :-

A

Zygotene

B

Pachytene

C

Diplotene

D

Diakinesis

Question 30: Palette 30/160

Allen MCQ

Which of the two events maintain the constant number of chromosomes across generations?

A

Mitosis and Meiosis

B

Meiosis and fertilisation

C

Fertilisation and mitosis

D

Only meiosis

Question 31: Palette 31/160

Allen Match the Columns

Match the column-I with column-II and select the correct answer :-

Column-I	Column-II
(a) Pachytene (b) Zygotene (c) Diplotene (d) Leptotene (e) Diakinesis	(i) Bouquet stage (ii) Chiasmata visible (iii) Terminalisation (iv) Gene exchange (v) Synopsis

A

a-i, b-ii, c-iii,d-iv, e-v

B

a-iv, b-v, c-ii, d-i, e-iii

C

a-iii, b-iv, c-v, d-ii, e-i

D

a-ii, b-iii,c-iv, d-i, e-v

Question 32: Palette 32/160

Allen MCQ

Which part of plant is suitable for the study of meiosis?

A

Root apex

B

Ovary

C

Anther

D

Shoot apex

Question 33: Palette 33/160

Allen MCQ

Slipping of chiasmata towards the ends of bivalent is called :-

A

Terminalisation

B

Diakinesis

C

Interkinesis

D

Congression

Question 34: Palette 34/160

Allen MCQ

"Bouquet-stage" occur in which sub stages of prophase-I?

A

Leptotene

B

Zygotene

C

Pachytene

D

Diplotene

Question 35: Palette 35/160

Allen MCQ

At anaphase-II of meiosis each chromosome contains:-

A

4 chromatids

B

3 chromatids

C

2 chromatids

D

1 chromatid

Question 36: Palette 36/160

Allen MCQ

In Anaphase-I each chromosome composed of :-

A

One chromatid

B

Two chromatids

C

Four chromatids

D

Many chromatids

Question 37: Palette 37/160

Allen MCQ

In meiosis, division of centromere occurs during:-

A

Interphase

B

Anaphase - I

C

Anaphase - II

D

Metaphase - I

Question 38: Palette 38/160

Allen MCQ

In meiosis, nuclear membrane and nucleolus disappear during :-

A

Zygotene

B

Pachytene

C

Diakinesis

D

Metaphase - I

Question 39: Palette 39/160

Allen MCQ

Separation of homologous chromosomes during anaphase-I is called :-

A

Synopsis

B

Disjunction

C

Nondisjunction

D

Crossing over BCD039

Question 40: Palette 40/160

Allen MCQ

Diakinesis represents :-

A

transition to prophase

B

transition to metaphase

C

transition to anaphase

D

transition to telophase

Question 41: Palette 41/160

Allen MCQ

Synaptonemal complex is characteristic of :-

A

Mitotic chromosomes

B

Leptotene chromosomes

C

Paired meiotic chromosomes

D

Metaphase

Question 42: Palette 42/160

Allen MCQ

Each chromosome composed of one chromatid in:-

A

Anaphase – I

B

Anaphase – II

C

Metaphase – I

D

Metaphase – II

Question 43: Palette 43/160

Allen MCQ

If the number of bivalents are 8 in metaphase-I, what shall be the number of chromosomes in daughter cells after meiosis-I and meiosis-II respectively:-

A

8 and 4

B

4 and 4

C

8 and 8

D

16 and 8

Question 44: Palette 44/160

Allen MCQ

Which of the following not occurs in anaphase-I?

A

Segregation of homologous chromosomes

B

Shortening in spindle fibres

C

Poleward movement of chromosomes

D

Division of centromere

Question 45: Palette 45/160

Allen MCQ

In meiosis :-

A

Division of nucleus twice but replication of DNA only once

B

Division of nucleus twice and replication of DNA twice

C

Division of nucleus once and replication of DNA is also once

D

Division of nucleus once and DNA replication is twice

Question 46: Palette 46/160

Allen MCQ

After meiosis–I:-

A

the two chromatids of a chromosome are genetically similar

B

the two chromatids of a chromosome are genetically different

C

There occurs only one chromatid in each chromosome

D

Four similar daughter cells are formed

Question 47: Palette 47/160

Allen MCQ

The correct sequence of prophase-I of meiosis is :-

A

Leptotene, pachytene, zygotene, diplotene, diakinesis

B

Leptotene, diplotene, pachytene, zygotene, diakinesis

C

Leptotene, zygotene, pachytene, diplotene, diakinesis

D

Leptotene, zygotene, diakinesis, diplotene, pachytene

Question 48: Palette 48/160

Allen MCQ

Which of the following is called heterotypic division?

A

Meiosis–I

B

Meiosis–II

C

Mitosis

D

Amitosis

Question 49: Palette 49/160

Allen MCQ

DNA replication occurs before :—

A

Mitosis and meiosis—I

B

Mitosis, meiosis—I and meiosis—II

C

Meiosis-I only

D

Mitosis only

Question 50: Palette 50/160

Allen MCQ

Thick-thread stage is :—

A

Leptotene

B

Zygotene

C

Pachytene

D

Diplotene

Question 51: Palette 51/160

Allen MCQ

Crossing over that results in genetic recombination in higher organisms occurs between –

A

Non-sister chromatids of a bivalent

B

Two daughter nuclei

C

Two different bivalents

D

Sister chromatids of a bivalent

Question 52: Palette 52/160

Allen MCQ

When synapsis is complete all along the chromosome, the cell is said to have entered a stage called :-

A

Zygotene

B

Pachytene

C

Diplotene

D

Diakinesis

Question 53: Palette 53/160

Allen MCQ

If in a diploid plant cell the 'n' value is 16 then what is possible in metaphase - I of meiosis?

A

32 Bivalents

B

64 Bivalents

C

16 Bivalents

D

8 Bivalents

Question 54: Palette 54/160

Allen MCQ

Which one of the following statements is incorrect for interkinesis?

A

It is the stage between the two subphases (I & II) of a meiotic division

B

There is no replication of DNA

C

DNA replicate but chromosome number remains same

D

It is generally short lived.

Question 55: Palette 55/160

Allen MCQ

At anaphase-II, sister chromatids move towards opposite poles of the cell by :

A

Contraction in spindle fibre attached to kinetochores

B

Shortening of microtubules attached to kinetochores

C

Lengthening of microtubules attached to kinetochores

D

Relaxation in spindle fibre attached to kinetochores

Question 56: Palette 56/160

Allen MCQ

Synopsis occurs between :-

A

Two homologous chromosomes

B

A male and a female gamete

C

mRNA and ribosomes

D

Spindle fibres and centromere

Question 57: Palette 57/160

Allen MCQ

During gamete formation, the enzyme recombinase participates during :-

A

Prophase-I

B

Prophase-II

C

Metaphase-I

D

Anaphase-II

Question 58: Palette 58/160

Allen MCQ

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres :-

A

Anaphase I

B

Anaphase II

C

Metaphase I

D

Metaphase II

Question 59: Palette 59/160

Allen MCQ

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?

A

G₀ and G₁

B

G₁ and S

C

Only G₂

D

G₂ and M

Question 60: Palette 60/160

Allen MCQ

In 'S' phase of the cell cycle :-

A

Amount of DNA doubles in each cell.

B

Amount of DNA remains same in each cell.

C

Chromosome number is increased.

D

Amount of DNA is reduced to half in each cell.

Question 61: Palette 61/160

Allen MCQ

The enzyme recombinase is required at which stage of meiosis :

A

Pachytene

B

Zygotene

C

Diplotene

D

Diakinesis

Question 62: Palette 62/160

Allen MCQ

A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has :

A

same number of chromosomes but twice the amount of DNA

B

twice the number of chromosomes and four times the amount of DNA

C

four times the number of chromosomes and twice the amount of DNA

D

twice the number of chromosomes and twice the amount of DNA

Question 63: Palette 63/160

Allen MCQ

Arrange the following events of meiosis in correct sequence:
(a) Crossing over
(b) Synopsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus

A

(b), (c), (d), (a)

B

(b), (a), (d), (c)

C

(b), (a), (c), (d)

D

(a), (b), (c), (d)

Question 64: Palette 64/160

Allen MCQ

Spindle fibres attach on to :-

A

Telomere of the chromosome

B

Kinetochore of the chromosome

C

Centromere of the chromosome

D

Kinetosome of the chromosome

Question 65: Palette 65/160

Allen MCQ

In meiosis crossing over is initiated at :

A

Pachytene

B

Leptotene

C

Zygotene

D

Diplotene

Question 66: Palette 66/160

Allen MCQ

During cell growth, DNA synthesis takes place in:-

A

$G_{2}$ phase

B

M phase

C

S phase

D

$G_{1}$ phase

Question 67: Palette 67/160

Allen MCQ

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

A

M

B

Both $G_{2}/M$ and M

C

$G_{1}/S$

D

$G_{2}/M$

Question 68: Palette 68/160

Allen Match the Columns

Match the stages of meiosis in Column-I to their characteristic features in Column-II and select the correct option using the codes given below :

Column-I	Column-II
(a) Pachytene (b) Metaphase-I (c) Diakinesis (d) Zygotene	(i) Pairing of homologous chromosomes (ii) Terminalization of chiasmata (iii) Crossing over takes place (iv) Chromosomes align at equatorial plate

A

a-ii, b-iv, c-iii, d-i

B

a-iv, b-iii, c-ii, d-i

C

a-iii, b-iv, c-ii, d-i

D

a-i, b-iv, c-ii, d-iii

Question 69: Palette 69/160

Allen MCQ

Which of the following options gives the correct sequence of events during mitosis?

A

Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase

B

Condensation→ crossing over
→ nuclear membrane disassembly
→ segregation → telophase

C

Condensation → arrangement at equator→ centromere division → segregation → telophase

D

Condensation → nuclear membrane disassembly → crossing over → segregation → telophase

Question 70: Palette 70/160

Allen MCQ

Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

A

Chromosomes will be fragmented

B

Chromosomes will not segregate

C

Recombination of chromosome arms will occur

D

Chromosomes will not condense

Question 71: Palette 71/160

Allen MCQ

The stage during which separation of the paired homologous chromosomes begins is

A

Pachytene

B

Diplotene

C

Diakinesis

D

Zygotene

Question 72: Palette 72/160

Allen MCQ

The correct sequence of phases of cell cycle is:

A

$M \rightarrow G_{1} \rightarrow G_{2} \rightarrow S$

B

$G_{1} \rightarrow G_{2} \rightarrow S \rightarrow M$

C

$S \rightarrow G_{1} \rightarrow G_{2} \rightarrow M$

D

$G_{1} \rightarrow S \rightarrow G_{2} \rightarrow M$

Question 73: Palette 73/160

Allen MCQ

Cells in $G_{0}$ phase:

A

exit the cell cycle

B

enter the cell cycle

C

suspend the cell cycle

D

terminate the cell cycle

Question 74: Palette 74/160

Allen MCQ

After meiosis-I, the resultant daughter cells have:

A

Same amount of DNA as in the parent cell in S phase

B

Twice the amount of DNA in comparison to haploid gamete.

C

Same amount of DNA in comparison to haploid gamete

D

Four times the amount of DNA in comparison to haploid gamete

Question 75: Palette 75/160

Allen MCQ

Crossing over takes place between which chromatids and in which stage of the cell cycle?

A

Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I.

B

Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.

C

Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I.

D

Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I.

Question 76: Palette 76/160

Allen MCQ

Match the following with respect to meiosis:

Column-I	Column-II
(a) Zygotene (b) Pachytene (c) Diplotene (d) Diakinesis	(i) Terminalization (ii) Chiasmata (iii) Crossing over (iv) Synopsis

A

a-ii, b-iv, c-iii, d-i

B

a-iii, b-iv, c-i, d-ii

C

a-iv, b-iii, c-ii, d-i

D

a-i, b-ii, c-iv, d-iii

Question 77: Palette 77/160

Allen MCQ

Identify the correct statement with regard to G₁ phase (Gap 1) of interphase.

A

Nuclear Division takes place.

B

DNA synthesis or replication takes place.

C

Reorganisation of all cell components takes place.

D

Cell is metabolically active, grows but does not replicate its DNA.

Question 78: Palette 78/160

Allen MCQ

Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of:

A

G₂ phase

B

M phase

C

G₁ phase

D

S phase

Question 79: Palette 79/160

Allen MCQ

Dissolution of the synaptonemal complex occurs during :

A

Leptotene

B

Pachytene

C

Zygotene

D

Diplotene

Question 80: Palette 80/160

Allen MCQ

Attachment of spindle fibres to kinetochores of chromosomes becomes evident in :

A

Anaphase

B

Telophase

C

Prophase

D

Metaphase

Question 81: Palette 81/160

Allen MCQ

In a mitotic cycle, the correct sequence of phases is

A

S, G₁, G₂, M

B

G₁, S, G₂, M

C

M, G₁, G₂, S

D

G₁, G₂, S, M

Question 82: Palette 82/160

Allen MCQ

During Meiosis-I, in which stage synapsis takes place?

A

Pachytene

B

Zygotene

C

Diplotene

D

Leptotene

Question 83: Palette 83/160

Allen MCQ

Match the following events that occur in their respective phases of cell cycle and select the correct option :

Column-I	Column-II
(a) G₁ phase (b) S phase (c) G₂ phase (d) Metaphase in M-phase	(i) Cell grows and organelle duplication (ii) DNA replication and chromosome duplication (iii) Cytoplasmic growth (iv) Alignment of chromosomes

A

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

B

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

C

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

D

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

Question 84: Palette 84/160

Allen MCQ

Which of the following stages of meiosis involves division of centromere?

A

Metaphase I

B

Metaphase II

C

Anaphase II

D

Telophase II

Question 85: Palette 85/160

Allen MCQ

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after S-phase?

A

8

B

16

C

4

D

32

Question 86: Palette 86/160

Allen MCQ

The centriole undergoes duplication during:

A

S-phase

B

Prophase

C

Metaphase

D

G₂ phase

Question 87: Palette 87/160

Allen MCQ

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

A

Leptotene

B

Zygotene

C

Diakinesis

D

Pachytene

Question 88: Palette 88/160

Allen MCQ

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:

A

Bivalent

B

Sites at which crossing over occurs

C

Terminalization

D

Synaptonemal complex

Question 89: Palette 89/160

Allen MCQ

Which one of the following never occurs during mitotic cell division?

A

Movement of centrioles towards opposite poles

B

Pairing of homologous chromosomes

C

Coiling and condensation of the chromatids

D

Spindle fibres attach to kinetochores of chromosomes

Question 90: Palette 90/160

Allen MCQ

Select the incorrect statement with reference to mitosis:

A

Spindle fibres attach to centromere of chromosomes.

B

Chromosomes decondense at telophase.

C

Splitting of centromere occurs at anaphase.

D

All the chromosomes lie at the equator at metaphase.

Question 91: Palette 91/160

Allen MCQ

Regarding Meiosis, which of the statements is incorrect?

A

DNA replication occurs in S phase of Meiosis-II

B

Pairing of homologous chromosomes and recombination occurs in Meiosis-I

C

Four haploid cells are formed at the end of Meiosis-II

D

There are two stages in Meiosis, Meiosis-I and II

Question 92: Palette 92/160

Allen MCQ

Which stage of meiosis can last for months or years in the oocytes of some verterbrates?

A

Leptotene

B

Pachytene

C

Diplotene

D

Diakinesis

Question 93: Palette 93/160

Allen MCQ

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme.

A

Phosphorylase

B

Recombinase

C

Transferase

D

Polymerase

Question 94: Palette 94/160

Allen MCQ

Identify the correct sequence of events during Prophase I of meiosis :
(a) Synopsis of homologous chromosomes
(b) Chromosomes become gradually visible under microscope
(c) Crossing over between non-sister chromatids of homologous chromosomes
(d) Terminalisation of chiasmata
(e) Dissolution of synaptonemal complex
Choose the correct answer from the options given below :

A

(a), (b), (c), (d), (e)

B

(b), (c), (d), (e), (a)

C

(b), (a), (c), (e), (d)

D

(a), (c), (d), (e), (b)

Question 95: Palette 95/160

Allen MCQ

Bivalent or Tetrad formation is a characteristic feature observed during :

A

Synaptonemal complex in zygotene stage

B

Chiasmata in Diplotene stage

C

Synaptonemal complex in Pachytene stage

D

Chiasmata in zygotene stage

Question 96: Palette 96/160

Allen MCQ

With respect to metaphase, which of the following statements is incorrect?

A

Complete disintegration of nuclear envelope takes place

B

Chromosomes are highly condensed

C

Metaphase chromosomes are made up of four sister chromatids held together by centromere

D

Chromosomes lie at the equator of the cell

Question 97: Palette 97/160

Allen MCQ

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

A

Pachytene

B

Diplotene

C

Diakinesis

D

Zygotene

Question 98: Palette 98/160

Allen MCQ

Which of the following stages of meiosis involves division of centromere?

A

Metaphase II

B

Anaphase II

C

Telophase

D

Metaphase I

Question 99: Palette 99/160

Allen MCQ

Among eukaryotes, replication of DNA takes place in -

A

S phase

B

$G_{1}$ phase

C

$G_{2}$ phase

D

M phase

Question 100: Palette 100/160

Allen Match the Columns

Match Column-I with Column-II:

Column-I	Column-II
(a) M Phase (b) G₂ Phase (c) Quiescent stage (d) G₁ Phase	(i) Proteins are synthesized (ii) Inactive phase (iii) Interval between mitosis and initiation of DNA replication (iv) Equational division

A

a-iv, b-ii, c-i, d-iii

B

a-iv, b-i, c-ii, d-iii

C

a-ii, b-iv, c-i, d-iii

D

a-iii,b-ii, c-iv, d-i

Question 101: Palette 101/160

Allen MCQ

Select the correct statements.
(A) Tetrad formation is seen during Leptotene.
(B) During Anaphase, the centromeres split and chromatids separate.
(C) Terminalization takes place during Pachytene.
(D) Nucleolus, Golgi complex and ER are reformed during Telophase.
(E) Crossing over takes place between sister chromatids of homologous chromosome.
Choose the correct answer from the options given below:

A

B and D only

B

A, C and E only

C

B and E only

D

A and C only

Question 102: Palette 102/160

Allen MCQ

The dissolution of synaptonemal complex occurs during :

A

Pachytene

B

Diplotene

C

Diakinesis

D

Leptotene

Question 103: Palette 103/160

Allen MCQ

Doubling of the number of chromosomes can be achieved by disrupting mitotic cell division soon after :

A

Anaphase

B

Telophase

C

Prophase

D

Metaphase

Question 104: Palette 104/160

Allen MCQ

During which stages of mitosis and meiosis, respectively does the centromere of each chromosome split?

A

Mataphase, Metaphase II

B

Prophase, Telophase I

C

Telophase, Anaphase I

D

Anaphase, Anaphase II

Question 105: Palette 105/160

Allen MCQ

Which one of the following is the quiescent stage of cell cycle?

A

M

B

$G_{2}$

C

$G_{1}$

D

$G_{0}$

Question 106: Palette 106/160

Allen MCQ

Select correct sequence of substages of Prophase-I of Meiotic division:
(A) Zygotene (B) Pachytene
(C) Diakinesis (D) Leptotene
(E) Diplotene

A

(D), (B), (A), (E), (C)

B

(A), (B), (D), (E), (C)

C

(D), (A), (B), (E), (C)

D

(A), (D), (B), (C), (E)

Question 107: Palette 107/160

Allen MCQ

Spindle fibers attach to kinetochores of chromosomes during

A

Prophase

B

Metaphase

C

Anaphase

D

Telophase

Question 108: Palette 108/160

Allen MCQ

Given below are two statements: Statement-I : Chromosomes become gradually visible under light microscope during leptotene stage. Statement-II : The beginning of diplotene stage is recognized by dissolution of synaptonemal complex. In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement-I and Statement-II are true

B

Both Statement-I and Statement-II are false

C

Statement-I is true but Statement-II is false

D

Statement-I is false but Statement-II is true

Question 109: Palette 109/160

Allen Match the Columns

Match Column-I with Column-II :

Column-I	Column-II
(a) Diakinesis (b) Pachytene (c) Zygotene (d) Leptotene	(i) Synaptonemal complex formation (ii) Completion of terminalisation of chiasmata (iii) Chromosomes look like thin threads (iv) Appearance of recombination nodules

A

a-iv, b-ii, c-iii,d-i

B

a-i, b-ii, c-iv, d-iii

C

a-ii, b-iv, c-i, d-iii

D

a-iv, b-iii,c-ii, d-i

Question 110: Palette 110/160

Allen MCQ

Following are the stages of cell division:
(A)Gap 2 phase
(B) Cytokinesis
(C) Synthesis phase
(D) Karyokinesis
(E) Gap 1 phase

A

C-E-D-A-B

B

E-B-D-A-C

C

B-D-E-A-C

D

E-C-A-D-B

Question 111: Palette 111/160

Allen MCQ

Recombination between homologous chromosomes is completed by the end of :

A

Diakinesis

B

Zygotene

C

Diplotene

D

Pachytene

Question 112: Palette 112/160

Allen Match the Columns

Match Column-I with Column-II.

Column-I	Column-II
(a) Chiasmata formation (b) Crossing over (c) Synaptonemal complex formation (d) Terminalisation of chiasmata	(i) Pachytene (ii) Diakinesis (iii) Diplotene (iv) Zygotene

A

a-iii, b-i, c-iv, d-ii

B

a-ii, b-i, c-iii, d-iv

C

a-iii, b-i, c-ii, d-iv

D

a-ii, b-iii,c-iv, d-i

Question 113: Palette 113/160

Allen Match the Columns

Match Column-I with Column-II.

Column-I	Column-II
(a) Cell are metabolically active and proliferate (b) DNA replication takes place (c) Proteins are synthesised (d) Quiescent state with metabolically active cells	(i) G₂ phase (ii) G₁ phase (iii) G₀ phase (iv) S phase

A

a-iv, b-ii, c-iii, d-i

B

a-i, b-iii, c-iv, d-ii

C

a-ii, b-i, c-iii, d-iv

D

a-ii, b-iv, c-i, d-iii

Question 114: Palette 114/160

Allen MCQ

Which one is correct for $G_{0}$ stage?
(I) It is a quiescent stage.
(II) In this phase cell cycle is stopped
(III) $G_{0}$ cells do not proliferate but metabolically active
(IV) $G_{0}$ cells can divide in response to some stimulus

A

All are correct

B

Only I, II, III are correct

C

Only I, II are correct

D

Only I and IV are correct

Question 115: Palette 115/160

Allen MCQ

Which of the following is not correctly matches a phase of the cell cycle with its function?

A

Second gap phase Period of cytoplasmic growth

B

First gap phase Most of the organelle duplication

C

Interphase Phase of preparation for cell division

D

DNA synthesis phase Doubling of number of chromosomes in cell

Question 116: Palette 116/160

Allen MCQ

Mark incorrect statements :-
(A) Meiosis involves only a single cycle of DNA replication
(B) Four haploid cells are formed at the end of meiosis-I
(C) Meiosis occurs in diploid cells
(D) In yeast, cell cycle takes about 90 minutes.

A

A and B

B

A and C

C

Only B

D

All are correct

Question 117: Palette 117/160

Allen MCQ

Prophase-I of meiotic division is typically longer and more complex, it is subdivided into five phases, on the basis of :-

A

Staining

B

Behaviour of chromosomes

C

Duration

D

Number of chromosomes

Question 118: Palette 118/160

Allen MCQ

Arrange the following events of meiosis in the correct sequence -
(A) Terminalisation of chiasmata
(B) Crossing over
(C) Synopsis
(D) Disjunction of chromosomes
(E) Dissolution of synaptonemal complex

A

A → B → C → D → E

B

E → D → C → B → A

C

C → B → D → E → A

D

C → B → E → A → D

Question 119: Palette 119/160

Allen MCQ

Identify the following diagram-

A

Transition to Metaphase

B

Transition to Anaphase-II

C

Transition to Metaphase-I

D

Transition to Anaphase

Question 120: Palette 120/160

Allen MCQ

The drawing below shows a cell whose diploid chromosome number is four. This cell is in:-

A

Metaphase of mitosis

B

Anaphase of mitosis

C

First anaphase of meiosis

D

Second anaphase of meiosis

Question 121: Palette 121/160

Allen MCQ

Label the structures indicated by (i), (ii), (iii) and (iv) in below given diagram –

A

(i)-Chromatid, (ii)-Centriole,
(iii)-Centromere, (iv)-Chromosome

B

(i)-Chromosome, (ii)-Centriole,
(iii)-Centromere, (iv)-Chromatid

C

(i)-Chromatid, (ii)-Centromere,
(iii)-Centriole, (iv)-Chromosome

D

(i)-Chromosome, (ii)-Centromere,
(iii) Centriole, (iv)-Chromatid

Question 122: Palette 122/160

Allen MCQ

Interkinesis is stage between :-

A

Two mitotic divisions

B

Two phases of meiotic divisions

C

Anaphase and telophase

D

Leptotene and zygotene

Question 123: Palette 123/160

Allen MCQ

It is significant to note that in the 24 hour average duration of cell cycle of human cell, cell division proper lasts for only about:-

A

Four hours

B

90 minutes

C

An hour

D

10 hours

Question 124: Palette 124/160

Allen MCQ

In which stage of mitotic division, cells do not show Golgi complex, ER, nucleolus and nuclear envelope?

A

Metaphase

B

Late prophase

C

Anaphase

D

All of these

Question 125: Palette 125/160

Allen MCQ

Condensation of chromosomes is completed in:-

A

Prophase

B

Interphase

C

Metaphase

D

Anaphase

Question 126: Palette 126/160

Allen MCQ

Regarding to cell cycle which of the following statements is wrong?

A

Cytoplasm increase is a continuous process

B

DNA synthesis occurs only during one specific stage

C

Replicated chromosomes distributed to daughter nuclei by complex series of events

D

Events for replicated chromosomes distribution are not under genetic control

Question 127: Palette 127/160

Allen MCQ

About cell cycle, which of the following statements is correct?

A

In $G_{0}$ phase cells are metabolically inactive

B

In $G_{0}$ phase cells are metabolically active

C

Diploid somatic cells of animals divide only by meiotic division

D

In plants only haploid cells can show mitotic divisions

Question 128: Palette 128/160

Allen MCQ

Chromatin condensation and movement of duplicated centrioles towards opposite poles can be observed during-

A

Prophase

B

Metaphase

C

Anaphase

D

Telophase

Question 129: Palette 129/160

Allen MCQ

Regarding arrangement of chromosomes on equator during metaphase, which of the following statements is incorrect?

A

Each chromatid remains connected by one spindle fibres from both poles

B

Each chromosome remains connected by spindle fibres from both poles

C

Spindle fibres remain attached on kinetochores of both the chromatids

D

Each chromatid remains connected at one pole by spindle fibres

Question 130: Palette 130/160

Allen MCQ

Match the following -

Column-I	Column-II
(a) Prophase (b) Metaphase (c) Anaphase (d) Telophase	(i) Decondensation (ii) Division of centromere (iii) Attachment of spindle fibres on kinetochores of chromosome (iv) Initiation of assembly of mitotic spindle

A

a-(iv) b-(iii) c-(i) d-(ii)

B

a-(iv) b-(iii) c-(ii) d-(i)

C

a-(iii) b-(iv) c-(ii) d-(i)

D

a-(iii) b-(iv) c-(i) d-(ii)

Question 131: Palette 131/160

Allen MCQ

Which of the following is not a significance of mitosis?

A

Maintenance of identical genetic complement

B

Cell repair

C

Restore nucleo cytoplasmic ratio

D

Genetic variability

Question 132: Palette 132/160

Allen MCQ

Meiosis ensures the production of ..... phase in life cycle of sexually reproducing organism, where as fertilisation restores ...... phase.

A

diploid, haploid

B

haploid, triploid

C

diploid, triploid

D

haploid, diploid

Question 133: Palette 133/160

Allen MCQ

Regarding key features of meiosis select out the wrong one -

A

Meiosis involves two sequential cycles of nuclear and cell division called meiosis- I & meiosis- II

B

Meiosis is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S - Phase

C

Meiosis involves pairing of homologous chromosomes and recombination between non homologous chromosome

D

Four haploid cells are formed at the end of meiosis-II

Question 134: Palette 134/160

Allen MCQ

Select the odd one -

A

Zygotene – Synaptonemal complex appearance

B

Pachytene – Appearance of recombination nodule

C

Diplotene – Terminalisation of chiasmata

D

Diakinesis – Assembly of meiotic spindle

Question 135: Palette 135/160

Allen MCQ

A cell has 46 chromosomes at each pole in mitotic telophase. In this division the number of chromatids at the metaphase was :-

A

23

B

46

C

92

D

69

Question 136: Palette 136/160

Allen MCQ

Match the following :-

Column-I	Column-II
(a) Prophase-II (b) Metaphase-II (c) Anaphase-II (d) Telophase-II	(i) Enclosure of chromosomes in nuclear envelope (ii) Separation of sister chromatids (iii) Chromosome alignment on equator (iv) Disappearance of nuclear membrane

A

a-(iv) b-(iii) c-(i) d-(ii)

B

a-(iv) b-(iii) c-(ii) d-(i)

C

a-(iv) b-(ii) c-(iii) d-(i)

D

a-(iv) b-(i) c-(ii) d-(iii)

Question 137: Palette 137/160

Allen MCQ

Which of the following is not a significance of meiosis?

A

Helps in conservation of specific chromosome number in each species

B

Increase in genetic variability

C

Helps in evolution

D

Helps in growth of organism

Question 138: Palette 138/160

Allen MCQ

Number of chromatids in each chromosome at anaphase is-

A

One in mitosis, one in meiosis-I and two in meiosis-II

B

One in mitosis, two in meiosis-I and one in meiosis-II

C

Two in mitosis, one in meiosis-I and two in meiosis-II

D

Two in mitosis, two in meiosis-I and two in meiosis-II

Question 139: Palette 139/160

Allen MCQ

During meiosis how many cycles of nucleus division, DNA replication and division of centromere take place respectively?

A

Three, Two, One

B

One, Two, Two

C

Two, Two, One

D

Two, One, One

Question 140: Palette 140/160

Allen MCQ

Cell cycle includes :-

A

Cell division

B

DNA replication

C

Cell growth

D

All of the above

Question 141: Palette 141/160

Allen MCQ

Interphase of an animal cell is differ from interphase of a plant cell :-

A

in having DNA replication

B

in having centrioles duplication

C

in having growth of cell

D

in having metabolically active cell

Question 142: Palette 142/160

Allen MCQ

Multinucleated condition in the liquid endosperm of coconut arises because :-

A

DNA replication not occurs during cell cycle

B

Separation of sister chromatids not occurs in anaphase

C

Condensation of chromosomal material not occurs in prophase

D

Karyokinesis is not followed by cytokinesis

Question 143: Palette 143/160

Allen MCQ

Which of the following phases can last for months or years in oocytes of some vertebrates?

A

Leptotene

B

Zygotene

C

Pachytene

D

Diplotene

Question 144: Palette 144/160

Allen MCQ

Which of the following organelles can be observed in a cell even after completion of prophase?

A

Golgi complex

B

Mitochondria

C

Nucleus

D

Endoplasmic reticulum

Question 145: Palette 145/160

Allen MCQ

A mouse cell is treated with a chemical that interferes with the activity of actin protein. Which of the following will probably be affected the most?

A

Formation of spindle fibres

B

Division of cytoplasm

C

Chromosome duplication

D

Pairing of homologous chromosomes

Question 146: Palette 146/160

Allen MCQ

Number of chromosome pairs at equator in metaphase-I of a diploid plant cell (for which n = 25) shall be-

A

50

B

100

C

75

D

25

Question 147: Palette 147/160

Allen MCQ

In a diploid cell before S-phase if quantity of DNA is 20 pico gram (pg) then after meiosis I what will be the quantity of DNA in each daughter cell?

A

10 pg

B

20 pg

C

5 pg

D

40 pg

Question 148: Palette 148/160

Allen MCQ

Diploid cell in human, where cell division does not occur :- (a) Heart cell (b) Muscle cell (c) Nerve cell Options :-

A

Only c

B

b and c

C

a and c

D

a, b and c

Question 149: Palette 149/160

Allen MCQ

Given below are two statement - Statement-I : M-phase is the most dramatic phase of cell cycle, involving a major reorganisation of virtually all component of cell. Statement-II : Cells in $G_{0}$ -stage remain metabolically inactive but no longer proliferate unless called on to do so depending on the requirement of the organism. In the light of the above statements, choose the correct answer from the options given below :-

A

Both statement I and statement II are correct

B

Both statement I and statement II are incorrect

C

Statement I is correct but statement II is incorrect

D

Statement I is incorrect but statement II is correct

Question 150: Palette 150/160

Allen MCQ

Assertion (A) : Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organism. Reason (R) : Meiosis involve reduction in chromosome number to half as that of parent cell.

A

Both Assertion and Reason are True and the Reason is a correct explanation of the Assertion.

B

Both Assertion and Reason are True but Reason is not a correct explanation of the Assertion.

C

Assertion is True but the Reason is False.

D

Both Assertion and Reason are False.

Question 151: Palette 151/160

Allen MCQ

Assertion (A) : Cytokinesis in plant cell occur by cell plate formation method. Reason (R) : Cytokinesis in animal cells occur by the formation of cell furrow.

A

Both Assertion and Reason are True and the Reason is a correct explanation of the Assertion.

B

Both Assertion and Reason are True but Reason is not a correct explanation of the Assertion.

C

Assertion is True but the Reason is False.

D

Both Assertion and Reason are False.

Question 152: Palette 152/160

Allen MCQ

Assertion (A) : No replication of DNA is needed between meiosis-I and meiosis-II. Reason (R) : Chromosomes are already duplicated and they already have two sister chromatids.

A

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

B

(A) is correct but (R) is not correct.

C

(A) is incorrect but (R) is correct.

D

Both (A) and (R) are correct but (R) is the correct explanation of (A).

Question 153: Palette 153/160

Allen MCQ

What will be the ratio of number of chromosomes and amount of DNA in $G_{1}$ , S and $G_{2}$ phases for a somatic cell? $G_{1}$ S $G_{2}$

A

1:1 1:1 1:1

B

1:1 1:2 1:2

C

1:2 1:2 1:2

D

1:2 1:1 1:2

Question 154: Palette 154/160

Allen MCQ

Given below is a schematic break-up of the phases/stages of cell cycle :- Which one of the following is the correct indication of the stage/phase in the cell cycle?

A

A – Cytokinesis

B

B – Metaphase

C

C – Karyokinesis

D

D – Synthetic phase

Question 155: Palette 155/160

Allen MCQ

During mitosis ER and nucleolus begin to disappear at :

A

Early prophase

B

Late prophase

C

Early metaphase

D

Late metaphase

Question 156: Palette 156/160

Allen MCQ

Which stages of cell division do the following figures A and B represent respectively? (A) (B)

A

Prophase
- Anaphase

B

Metaphase
- Telophase

C

Telophase
- Metaphase

D

Late Anaphase
- Prophase

Question 157: Palette 157/160

Allen MCQ

Select the correct option with respect to mitosis

A

Chromatids separate but remain in the centre of the cell in anaphase.

B

Chromatids start moving towards opposite poles in telophase.

C

Golgi complex and endoplasmic reticulum are still visible at the end of prophase.

D

Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

Question 158: Palette 158/160

Allen MCQ

At metaphase, chromosomes are attached to the spindle fibres by their :-

A

Centromere

B

Satellites

C

Secondary constrictions

D

Kinetochores

Question 159: Palette 159/160

Allen MCQ

Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

A

Prophase of Mitosis

B

Both prophase and metaphase of mitosis

C

Prophase I during meiosis

D

Prophase II during meiosis

Question 160: Palette 160/160

Allen MCQ

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.

A

Telophase – Endoplasmic reticulum and nucleolus not reformed yet.

B

Telophase – Nuclear envelope reforms, Golgi complex reforms.

C

Late anaphase – Chromosomes move away from equatorial plate, Golgi complex not present.

D

Cytokinesis – Cell plate formed, mitochondria distributed between two daughter cells.