Identify the statements which are true for both RNA and DNA.
(A) Two nucleotides are linked through 3'-5' phosphodiester linkage.
(B) Nitrogenous bases are linked to the sugar moiety. (C) Additional -OH is present at 2'-position in the sugar.
(D) 5-methyl uracil is present.
Choose the correct answer from the options given below :
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(A), (B) and (C) Only.

(A), (B) and (D) Only.

(A) and (B) Only.

(B) and (C) Only.

Correct Answer

(A) and (B) Only.

Detailed Explanation

The chemical structure of a polynucleotide chain (DNA or RNA) comprise a nucleotide that has 3 components - a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group. Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide. More nucleotides can be joined in such a manner to form a polynucleotide chain. The backbone of a polynucleotide chain is formed due to sugar and phosphates. The nitrogenous bases linked to sugar moiety project from the backbone.

In RNA, every nucleotide residue has an additional -OH group present at 2'-position in the ribose. Also, in RNA the uracil is found at the place of thymine (5-methyl uracil, another chemical name for thymine).