**Ribozymes** are:
ADNA molecules with enzymatic activity
BCatalytic RNA molecules — evidence for RNA World hypothesis
CProtein enzymes that synthesise RNA
DDNA-binding proteins
Answer & Solution
Correct answer: B. Catalytic RNA molecules — evidence for RNA World hypothesis
Ribozymes are catalytic RNAs (e.g. self-splicing introns in *Tetrahymena*, RNase P, ribosomal peptidyl transferase). Discovered independently by Altman and Cech (Nobel Prize 1989). Their existence strongly supports the RNA-World hypothesis.
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