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Cell Cycle And Cell Division

161 Questions Start Allen Test
All Exams Allen
Q51 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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
Q52 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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
Q53 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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
Q54 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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.
Q55 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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
Q56 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS MCQ
Synopsis occurs between :-
A.
Two homologous chromosomes
B.
A male and a female gamete
C.
mRNA and ribosomes
D.
Spindle fibres and centromere
Q57 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS MCQ
During gamete formation, the enzyme recombinase participates during :-
A.
Prophase-I
B.
Prophase-II
C.
Metaphase-I
D.
Anaphase-II
Q58 Allen 2. MEIOSIS, SIGNIFICANCE OF MEIOSIS, DIFFERENCES BETWEEN MITOSIS AND MEIOSIS 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
Q59 Allen 3. PYQ 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
Q60 Allen 3. PYQ 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.
Q61 Allen 3. PYQ MCQ
The enzyme recombinase is required at which stage of meiosis :
A.
Pachytene
B.
Zygotene
C.
Diplotene
D.
Diakinesis
Q62 Allen 3. PYQ 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
Q63 Allen 3. PYQ 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)
Q64 Allen 3. PYQ 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
Q65 Allen 3. PYQ MCQ
In meiosis crossing over is initiated at :
A.
Pachytene
B.
Leptotene
C.
Zygotene
D.
Diplotene
Q66 Allen 3. PYQ MCQ
During cell growth, DNA synthesis takes place in:-
A.
$G_{2}$ phase
B.
M phase
C.
S phase
D.
$G_{1}$ phase
Q67 Allen 3. PYQ 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.
$G_{2}/M$
Q68 Allen 3. PYQ 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-IColumn-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
Q69 Allen 3. PYQ 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
Q70 Allen 3. PYQ 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
Q71 Allen 3. PYQ MCQ
The stage during which separation of the paired homologous chromosomes begins is
A.
Pachytene
B.
Diplotene
C.
Diakinesis
D.
Zygotene
Q72 Allen 3. PYQ 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.
$G_{1} \rightarrow S \rightarrow G_{2} \rightarrow M$
Q73 Allen 3. PYQ 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
Q74 Allen 3. PYQ 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
Q75 Allen 3. PYQ 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.