Question

A RNA molecule is ______.

विकल्प

• usually double-stranded

• usually single-stranded

• always double-stranded

• a double helix

Answer 1

A RNA molecule is usually single-stranded.

Explanation:

RNA is normally a single polynucleotide chain (mRNA, tRNA, and rRNA are described as single‑stranded). It often folds and forms short double‑stranded regions by intramolecular base‑pairing (secondary structure), but the molecule as a whole is typically single‑stranded.