BIO NMDCAT Ribonucleic acid (RNA)

nmdcat.online July 3, 2026

16. During the synthesis of an RNA strand, the incoming nucleotide is attached to the

A. 5' carbon of the existing strand

B. 3' hydroxyl group of the existing strand

✓

C. Nitrogenous base of the template strand

D. 2' hydroxyl group of the existing strand

📝 Explanation

RNA polymerase adds new nucleotides exclusively to the free 3'-OH group of the growing RNA polymer, moving in a 5' to 3' direction.

📖 Additional Information

5' carbon of the existing strand
3' hydroxyl group of the existing strand
Nitrogenous base of the template strand
2' hydroxyl group of the existing strand

RNA polymerase adds new nucleotides exclusively to the free 3'-OH group of the growing RNA polymer, moving in a 5' to 3' direction.

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