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Question
A RNA molecule is ______.
Options
usually double-stranded
usually single-stranded
always double-stranded
a double helix
MCQ
Fill in the Blanks
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Solution
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.
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