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Molecular Basis Of Inheritance

394 Questions Start Allen Test
All Exams Allen
Q276 Allen Molecular Basis of Inheritance Match the Columns
Match Column-I with Column-II.
Column-IColumn-II
(a)Histones
(b)Nucleosome
(c)Euchromatin
(d)Heterochromatin
(i)Loosely packed chromatin
(ii)Densely packed chromatin
(iii)Positively charged basic proteins
(iv)DNA wrapped around histone octamer
A.
a-iv, b-iii, c-ii, d-i
B.
a-iii, b-i, c-iv, d-ii
C.
a-ii, b-iii, c-iv, d-i
D.
a-iii, b-iv, c-i, d-ii
Q277 Allen Molecular Basis of Inheritance MCQ
Statement-I: In the lac operon, the z gene codes for beta-galactosidase which is primarily responsible for the hydrolysis of lactose into galactose and glucose. Statement-II: In addition to lactose, glucose or galactose can also induce lac operon. In the light of the above statements, choose the correct answer from the options given below :
A.
Statement I is true but Statement Il is false
B.
Statement I is false but Statement Il is true
C.
Both Statement I and Statement Il are true
D.
Both Statement I and Statement Il are false
Q278 Allen Molecular Basis of Inheritance MCQ
Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to:
(a) Substitution
(b) Addition
(c) Deletion
(d) Translocation
(e) Inversion
A.
C and D only
B.
D and E only
C.
A and B only
D.
B and C only
Q279 Allen NCERT BASED QUESTIONS MCQ
Match the following :-
Column-IColumn-II
(a)φ×174
(b)Lambda phage
(c)E.coli
(d)Human somatic cell
(i)48502 bp
(ii)5386 Nucleotides
(iii)6.6 x 109 bp
(iv)4.6 x 10⁶ bp
A.
a–(i), b−(ii),c–(iv), d−(iii)
B.
a–(ii),b–(i), c–(iv), d−(iii)
C.
a−(i), b–(ii),c–(iii),d−(iv)
D.
a–(iv),b–(iii),c–(ii),d−(i)
Q280 Allen NCERT BASED QUESTIONS MCQ
Which of the following pyrimidine base is common in both DNA and RNA:-
A.
Adenine
B.
Guanine
C.
Cytosine
D.
Thymine
Q281 Allen NCERT BASED QUESTIONS MCQ
In nucleoside which of the following bond exists between sugar and nitrogenous base:-
A.
Phosphodiester bond
B.
Hydrogen bond
C.
Phosphoester bond
D.
N-glycosidic bond
Q282 Allen NCERT BASED QUESTIONS MCQ
By which of the following bond phosphoric acid remain linked with 5' carbon of sugar in one nucleotide:-
A.
Phosphoester bond
B.
Phosphodiester bond
C.
N-Glycosidic bond
D.
Hydrogen bond
Q283 Allen NCERT BASED QUESTIONS MCQ
The backbone in a polynucleotide chain is formed due to:-
A.
Sugars and nitrogenous bases
B.
Phosphates and nitrogenous base
C.
Nitrogenous bases and histones
D.
Sugar and phosphates
Q284 Allen NCERT BASED QUESTIONS MCQ
In RNA, every nucleotide residue has an additional - OH group at which of the following position?
A.
2' position of deoxyribose
B.
1' position of ribose sugar
C.
3' position of ribose sugar
D.
2' position of ribose sugar
Q285 Allen NCERT BASED QUESTIONS MCQ
DNA as an acidic substance present in nucleus was first identified by:-
A.
Wilkins and Franklin
B.
Watson and Crick
C.
Friedrich Miescher
D.
Altmann
Q286 Allen NCERT BASED QUESTIONS MCQ
Double helix model of DNA proposed by Watson and Crick was based on:-
A.
X-ray diffraction data of Miescher
B.
X-ray crystallography data of Wilkins and Franklin
C.
X-ray diffraction data of Watson and Crick
D.
X-ray diffraction data of Chargaff
Q287 Allen NCERT BASED QUESTIONS MCQ
Regarding to features of double helix structure of DNA which of the following is wrong?
A.
Two polynucleotide chains have antiparallel polarity
B.
The bases in two strands are paired through phosphodiester bonds
C.
Adenine form two hydrogen bonds with thymine
D.
The pitch of the helix is 3.4 nm
Q288 Allen NCERT BASED QUESTIONS MCQ
In addition to hydrogen bonding which of the following feature confers stability to helical structure?
A.
Phosphodiester bond
B.
Pairing between one purine and one pyrimidine
C.
Glycosidic linkage between sugar and nitrogenous base
D.
The plane of one base pair stacks over the other
Q289 Allen NCERT BASED QUESTIONS MCQ
Which of the following is responsible for constantdistancebetween two polynucleotide chains in DNA?
A.
Antiparallel polarity of two polynucleotide strands
B.
Hydrogen bonding
C.
Pairing between one purine and one pyrimidine
D.
All the above
Q290 Allen NCERT BASED QUESTIONS MCQ
Phosphoric acid remain associated with which of the following carbon of sugar in a nucleotide ?
A.
$1 ^ { \mathsf { s t } }$
B.
$3 ^ { \mathsf { r d } }$
C.
$4 ^ { \mathrm { t h } }$
D.
$5 ^ { \mathrm { t h } }$
Q291 Allen NCERT BASED QUESTIONS MCQ
If there are $3 . 3 \times 1 0 ^ { 9 }$ bp present in genome, then what would be the length of the DNA of any somatic cell?
A.
1.1 meter
B.
2.2 meter
C.
3.3 meter
D.
6.6 meter
Q292 Allen NCERT BASED QUESTIONS MCQ
Positive charge and basic nature of histone is due to abundance of:-
A.
Lysine and tryptophan
B.
Arginine & threonine
C.
Lysine and arginine
D.
Tryptophan and threonine
Q293 Allen NCERT BASED QUESTIONS MCQ
Negative charge of DNA is due to which of the following constituent:-
A.
Sugar
B.
Nitrogenous base
C.
Phosphoric acid
D.
Hydroxyl group (-OH) present on sugar BMI292
Q294 Allen NCERT BASED QUESTIONS MCQ
A typical nucleosome contains how much amount of DNA?
A.
100 bp
B.
146 bp
C.
200 bp
D.
346 bp
Q295 Allen NCERT BASED QUESTIONS MCQ
In a mammalian somatic cell how many nucleosomes are present?
A.
$6 . 6 \times 1 0 ^ { 9 }$
B.
$3 . 3 \times 1 0 ^ { 9 }$
C.
$3 . 3 \times 1 0 ^ { 7 }$
D.
$3 . 3 \times 1 0 ^ { 5 }$
Q296 Allen NCERT BASED QUESTIONS MCQ
Which of the following is actual sequence of packaging of DNA in eukaryotic cells?
A.
DNA → Chromatin → Nucleosome → Chromosome
B.
DNA → Nucleosome → Chromosome → Chromatin
C.
DNA → Nucleosome → Chromatin → Chromosome
D.
DNA → Chromosome → Chromatin → Nucleosome
Q297 Allen NCERT BASED QUESTIONS MCQ
The packaging of chromatin at higher level requires additional set of proteins that is known as:-
A.
Histone proteins
B.
NHC proteins
C.
Homeotic proteins
D.
Domain proteins
Q298 Allen NCERT BASED QUESTIONS MCQ
Regarding to Meselson and Stahl experiment for semi conservative nature of DNA replication select out the wrong statement: -
A.
15N of 15NH₄Cl was incorporated in DNA and other compounds
B.
15N & 14N can be differentiate on the basis of radioactive activity
C.
Heavy and normal DNA molecules could be distinguished by CsCl density gradient centrifugation
D.
15N used in 15NH₄Cl was not a radioactive isotope
Q299 Allen NCERT BASED QUESTIONS MCQ
If normal E. coli is allow to grow for 80 minutes in 15NH₄Cl medium then what would be the proportion of hybrid and heavy density DNA molecules:-
A.
1:7
B.
7:1
C.
14:2
D.
1:4
Q300 Allen NCERT BASED QUESTIONS MCQ
Semiconservative replication of DNA in chromosomes was proved by:-
A.
Meselson & Stahl by using1⁵NH₄Cl
B.
Taylor by using 1⁵NH₄Cl
C.
Meselson & Stahl by using tritiated thymidine
D.
Taylor by using tritiated thymidine