Bihar Board - Class 12 Biology-Chapter 6: Molecular Basis of Inheritance Multiple Choice Questions(MCQs)
Multiple Choice Questions
1. Circular ONA is found in
(a) viruses
(b) bacteria, chloroplast and mitochondria
(c) chloroplast and mitochondria alone
(d) all of these
Answer:b
2. DNA is present in
(a) mitochondria
(b) nucleus
(c) chloroplast
(d) All of these
Answer:d
3. DNA duplex shows
(a) left handed and parallel coiling
(b) left handed and antiparallel coiling
(c) right handed and parallel coiling
(d) right handed and antiparallel coiling
Answer:d
4. How much of DMA base sequence among humans is same?
(a) 50%
(b)80%
(c)99.9%
(d)3.4%
Answer:c
5. Bacterial nucleoid has
(a) one single-stranded DNA
(b) one double-stranded DNA
(c) two single-stranded DNA
(d) many double-stranded DNAs
Answer:b
6. Isotopes used in proving semiconservative replication of DNA were
(a)14N14C
(b)14N15N
(c) 14N 31P
(d)14C31P
Answer:b
7. Watson and Crick proposed the model of DNA structure in
(a) 1943
(b) 1953
(c)1963
(d)1965
Answer:d
8. How many pairs nucleotides are present in one turn of DNA helix?
(a) 4
(b)8
(c)9
(d) 10
Answer:b
9. If in a DNA molecule cytosine is 18%, the percentage of adenine would be
(a) 18%
(b)32%
(c)36%
(d)64%
Answer:b
10. The terms cistron, recon and muton were proposed by
(a)Benzer
(b) Morgan
(c)Lederberg
(d) Johansen
Answer:b
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