What is the condition required to observe B form of DNA?

a) Low humidity

b) High humidity

c) Low temperature

d) High temperature

2. What is the condition required to observe A form of DNA?

a) Low humidity

b) High humidity

c) Low temperature

d) High temperature

3. How many bases are there in per turn of the B form of DNA?

a) 8 bp

b) 9 bp

c) 10 bp

d) 11 bp

4. Which of the following is not a character of A DNA?

a) Short and broad

b) Left handed helix

c) Narrow minor groove

d) Broad and shallow major groove

5. How many bases are there in per turn of the A form of DNA?

a) 11 bp

b) 10 bp

c) 12 bp

d) 8 bp

6. Which of the following is not a character of B form of DNA?

a) Longer and thinner

b) Right-handed helix

c) Narrow minor groove

d) Flat major groove

7. In a right handed DNA the glycosidic bond is in syn configuration.

a) True

b) False

8. In the Z form of DNA the fundamental repeating unit is __________

a) Purine - pyrimidine nucleotide

b) Purine - pyrimidine dinucleotide

c) Purine - pyrimidine tri-nucleotide

d) Purine - pyrimidine tetra-nucleotide

9. What is the factor responsible for the left-handed helical conformation in Z form of DNA?

a) Syn conformation at pyrimidine

b) Anti conformation at pyrimidine

c) Syn conformation at purine

d) Anti conformation at purine