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MCQ on DNA : Multiple choice questions with answers in molecular biology for different competitive exams.
DNA (deoxyribonucleic acid) is the hereditary material in humans and almost all other organisms. DNA is molecule composed of two chains that coil around each other to form a double helix. The two DNA strands are also known as polynucleotides. They are composed of simpler monomeric units called nucleotides. Each nucleotides is composed of one of four nitrogen containing nucleobases adenine(A), guanine(G), cytosine(c), thymine(T). DNA bases pair up with each other, A with T and C with G to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule.
In this section ,we are providing multiple choice question on DNA with answers for your better performance in competitive exams.
1.DNA was first discovered by:-
A. Beadle and Tatum
B. Watson and Crick
C. Friedrich Miescher
D. A. Kornberg
Ans:C
2.How many nucleotides are present in one turn of DNA helix?
A. 4
B. 7
C. 8
D. 10
Ans:D
3.Distance between the two pairs of DNA is:-
A. 3.4 A'
B. 34 A'
C. 20 A'
D. 340A'
Ans:A
4.Instead of chromosomes which of the following has only DNA ?
A. Anabaena
B. Volvox
C. Chlamydomonas
D. Plasmodiophora
Ans:A
5.Which of the following is the smallest RNA?
A. m-RNA
B. r-RNA
C. t-RNA
D. chromosomal-RNA
ANS:C
6.The tertiary structure of t-RNA is :-
A. L-shaped
B. X-shaped
C. T-shaped
D. Y-shaped
Ans:A
7.What could be the maximum difference in DNA sequences of two individuals?
A. 99.9%
B. 0.2%
C. 1%
D. 100%
Ans:B
8.Circular DNA molecule occurs in:-
A. Viruses
B. Bacteria, Chloroplasts and mitochondria
C. Bacteria and Chloroplasts
D. Bacteria only
Ans:B
9.The enzyme needed for uncoiling two DNA strands is:-
A. DNA ligase
B. DNA helicase
C. DNA polymerase
D. DNA topoisomerases
Ans:B
10.what is the type of coiling in DNA?
A. Right handed
B. Left handed
C. Zig-zag
D. Opposite
Ans:A
11.The protein which helps to unwind DNA double helix during replication is:-
A. DNA polymerase
B. DNA gyrase
C. Helicase
D. DNA topoisomerase
Ans:C
12.Which of the following double stranded RNA is present?
A. Bacteria
B. Chloroplast
C. Mitochondria
D. Reovirus
Ans:D
13.Which one of the following is a RNA virus?
A. Hepatitis B virus
B. HIV
C. Papilloma virus
D. Epstein-barr virus
Ans:B
14. For DNA fingerprinting, the amount of DNA required is?
A. Only a few cells
B. at least one gram
C. About 100 micrograms
D. About one microgram
Ans:D
15. Who was the first director of Human Genome Project?
A. Dr James Watson
B. Dr Francis Collins
C. Dr Craig Venter
D. Claude Vorlihon
Ans:A
16. Who developed the method of DNA fingerprinting?
A. Kary Mullis
B. Stice and Robi
C. Frederick Sanger
D. Alec Jeffrey
Ans:D
17. Who was awarded Nobel Prize for synthesis of RNA?
A. S. Ochoa
B A. Kornberg
C. H. Khorana
D. Nirenberg
Ans:A
18.Left handed DNA is known as
A. B-DNA
B. Z-DNA
C. Both a and b
D. None of the above
Ans:B
19.The diameter of Z-DNA molecule is
A. 34 A
B. 20 A
C. 45 A
D. 3.4 A
Ans:C
20.The enzyme which catalyses the formation of RNA from DNA template is known as
A. DNA polymerase
B. RNA polymerase
C. reverse transcriptase
D. Nuclease
Ans:B
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