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Molecular Basis Of Inheritance

394 Questions Start Allen Test
All Exams Allen
Q351 Allen ANALYTICAL QUESTIONS MCQ
In a m-RNA sequence of $N _ { 2 } - b a s e$ is 5' AUG GUG CUC AAA' 3'. What is the correct sequence of anticodons which recognizes codons of m-RNA?

(a) (b)
(c) (d)
A.
a, b, c, d
B.
d, a, b, c
C.
c, d, b, a
D.
d, c, b, a
Q352 Allen ANALYTICAL QUESTIONS MCQ
Suppose evolution on earth has occurred in such a way that there are 96 amino acids instead of 20. DNA has 12 different types of bases and DNA synthesis occur in the same way as today. The minimum number of bases per codon would be:-
A.
12
B.
8
C.
2
D.
3
Q353 Allen ANALYTICAL QUESTIONS MCQ
Assume that their are 6 types of nitrogen bases available and 40 types of amino acid are available for protein synthesis, then in genetic code each codon made up by minimum how many nitrogen bases ?
A.
3
B.
4
C.
5
D.
2
Q354 Allen ANALYTICAL QUESTIONS MCQ
In a segment of DNA 3.2 kilobases are present. If DNA segment has 820 adenine molecules, then what will be number of cytosine ?
A.
1560
B.
1480
C.
780
D.
740
Q355 Allen ANALYTICAL QUESTIONS MCQ
Which statement is correct ?
(a) Degeneracy of code is related to, third member of codon.
(b) Single codon, codes for more than one amino acid.
(c) In codon first two bases are more specific.
(d) In codons, third base is wobble.
(e) Codon is nearly universal.
A.
a, b, c, d, e
B.
a, b, d
C.
a, c, d
D.
a, c, d, e
Q356 Allen ANALYTICAL QUESTIONS MCQ
Both the strand of DNA are not copied during transcription because :-
A.
If both strands act as a template, they would code for RNA with different sequence.
B.
The two RNA molecules, if produced simultaneously would be complementary to each other, hence would form a double stranded RNA.
C.
They would code, for RNA molecules with same sequences.
D.
Both (1) and (2) are correct BMI358
Q357 Allen ANALYTICAL QUESTIONS MCQ
The salient features of B-DNA are :—
(i) It is made of two polynucleotide chain
(ii) Back bone is constituted by sugar and nitrogen base
(iii)Two chains have parallel polarity
(iv) Bases in two strands are paired through H-bonds
(v) The two chains are coiled in a left handed fashion
A.
i, iv, v
B.
i, iv
C.
i, ii, v
D.
i, ii, iii, iv, v
Q358 Allen ANALYTICAL QUESTIONS MCQ
Which is incorrect for genetic code:-
(i) The codon is triplet
(ii) 64 codons code for amino acids
(iii) Genetic code is unambiguous
(iv) Genetic code is nearly universal
(v) AUG has dual functions
A.
only ii
B.
ii & iii
C.
iii, iv + v
D.
All are correct
Q359 Allen ANALYTICAL QUESTIONS MCQ
Which is correct ?
(i) t-RNA has an anticodon loop that has bases complementary to the codon.
(ii) t-RNA has an amino acid acceptor end.
(iii) t-RNA are specific for each amino acid.
(iv) For initiation, there is specific t-RNA that is referred to as initiator t-RNA.
(v) For termination there is specific t-RNA that is referred to as terminator t-RNA.
A.
i, ii
B.
i, ii, iii
C.
i, ii, iii, iv
D.
i, ii, iii, iv, v
Q360 Allen ANALYTICAL QUESTIONS MCQ
E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because:-
A.
They cannot synthesize functional beta galactosidase.
B.
They cannot transport lactose from the medium into the cell.
C.
The lac operon is constitutively active in these cells.
D.
In the presence of glucose, E. coli cells do not utilize lactose.
Q361 Allen ANALYTICAL QUESTIONS MCQ
DNA fragments separated by gel electrophoresis are shown. Mark the correct statement :-
A.
Band 3 contains more positively charged DNA molecule than 1
B.
Band '3' indicates more charge density than 1 and 2
C.
Band 1 has longer DNA fragment than 2 and 3
D.
All the bands have equal length and charges but differ in base composition
Q362 Allen ANALYTICAL QUESTIONS MCQ
Amino acid sequence, in protein synthesis is decided by the sequence of:-
A.
t-RNA
B.
m-RNA
C.
c-DNA
D.
r-RNA
Q363 Allen ANALYTICAL QUESTIONS MCQ
One gene-one enzyme hypothesis was postulated by:-
A.
R. Franklin
B.
Hershey and Chase
C.
A. Garrod
D.
Beadle and Tatum
Q364 Allen ANALYTICAL QUESTIONS MCQ
One turn of the helix in a B-form DNA is approximately:-
A.
20 nm
B.
0.34 nm
C.
3.4 nm
D.
2 nm
Q365 Allen ANALYTICAL QUESTIONS MCQ
Antiparallel strands of a DNA molecule means that :-
A.
one strand turns anti-clockwise
B.
the phosphate groups of two DNA strands, at their ends, share the same position
C.
the phosphate groups at the start of two DNA strands are in opposite position (pole)
D.
one strand turns clockwise
Q366 Allen ANALYTICAL QUESTIONS MCQ
Cri-du-chat syndrome in humans is caused by the :-
A.
Fertilization of an XX egg by a normal Y-bearing sperm
B.
Loss of half of the short arm of chromosome 5
C.
Loss of half of the long arm of chromosome 5
D.
Trisomy of 21st chromosome
Q367 Allen ANALYTICAL QUESTIONS MCQ
Triticale, the first man-made cereal crop, has been obtained by crossing wheat with:—
A.
Rye
B.
Pearl millet
C.
Sugarcane
D.
Barley
Q368 Allen ANALYTICAL QUESTIONS MCQ
Differentiation of organs and tissues in a developing organism, is association with :-
A.
Developmental mutations
B.
Differential expression of genes
C.
Lethal mutations
D.
Deletion of genes
Q369 Allen ANALYTICAL QUESTIONS MCQ
Molecular basis of organ differentiation depends on the modulation in transcription by:-
A.
RNA polymerase
B.
Ribosome
C.
Transcription factor
D.
Anticodon
Q370 Allen ANALYTICAL QUESTIONS MCQ
The Okazaki fragments in DNA chain growth:-
A.
Result in transcription.
B.
Polymerize in the 3'-to-5' direction and forms replication fork.
C.
Prove semi-conservative nature of DNA replication.
D.
Polymerize in the 5'-to-3' direction and explain 3'-to-5' DNA replication.
Q371 Allen ANALYTICAL QUESTIONS MCQ
The two polynucleotide chains in DNA are :-
A.
Parallel
B.
Discontinuous
C.
Antiparallel
D.
Semiconservative
Q372 Allen ANALYTICAL QUESTIONS MCQ
In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are :-
A.
n = 7 and x = 21
B.
n = 21 and x = 21
C.
n = 21 and x = 14
D.
n = 21 and x = 7
Q373 Allen ANALYTICAL QUESTIONS MCQ
Which of the following nitrogen base is not found in DNA?
A.
Thymine
B.
Cytosine
C.
Guanine
D.
Uracil
Q374 Allen ANALYTICAL QUESTIONS MCQ
Polysome is formed by :-
A.
A ribosome with several subunits
B.
Ribosomes attached to each other in a linear arrangement
C.
Several ribosomes attached to a single mRNA
D.
Many ribosomes attached to a strand of endoplasmic reticulum
Q375 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
A.
Guanine, Adenine – Purines
B.
Adenine, Thymine – Purines
C.
Thymine, Uracil – Pyrimidines
D.
Uracil, Cytosine – Pyrimidines