Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

Q. Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

A. L-sugar component

B. D-sugar component

C. Chiral phosphate unit

D. Base unit

Correct Answer: D-sugar component

Explanation

DNA and RNA are polymers made up of nucleotides. Each nucleotide consists of three components: a nitrogenous base, a pentose sugar and a phosphate group.

The sugar present in DNA is D-2-deoxyribose and in RNA is D-ribose.

These sugars contain asymmetric (chiral) carbon atoms, which make the entire DNA and RNA molecules chiral in nature.

The phosphate group is achiral and does not contribute to chirality.

Nitrogenous bases are also planar and achiral.

Therefore, the chirality in DNA and RNA arises due to the presence of D-sugar component.

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