A ribozyme is defined as:
Answer and explanation
Correct answer: C. A catalytic RNA molecule capable of accelerating specific chemical reactions
- Step 1: While most biological enzymes are globular proteins, certain RNA molecules exhibit true enzymatic catalytic activity.
- Step 2: Discovered by Thomas Cech and Sidney Altman, these catalytic RNAs are termed ribozymes.
- Step 3: In prokaryotic ribosomes, the 23S rRNA acts as a ribozyme (peptidyl transferase) that synthesizes peptide bonds during translation.
Answer
A catalytic RNA molecule capable of accelerating specific chemical reactions.
Why not the others: Complex of protein and lipid does not describe ribozymes; Regulatory steroid hormone is a small lipid molecule (e.g., cortisol); An enzyme that hydrolyzes ribose is ribonuclease (RNase) or a glycosidase.
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