Q.

Read the following statements.(i) The adjacent nucleotides in a nucleic acid are linked by phosphodiester bonds.(ii) Thiamine and uracil are not found in DNA.(iii) B-DNA has left-handed helical structure with 10 base pairs per turn.(iv) Pyrimidines are double-ring structures with four nitrogen atoms.     Which of the above statements are correct ?

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a

(i) and (ii)

b

(ii) and (iii)

c

(iii) and (iv)

d

(i) and (iv)

answer is A.

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Detailed Solution

Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide. Thiamine is a vitamin of B complex, not found in DNA. Pyrimidines are monocyclic (one C-N ring ) nitrogen bases.
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