AP Biologymediummcq1 pt
If mRNA is 5′-AUG GCA UGA-3′, how many amino acids does the polypeptide contain?
A.2
B.3
C.1
D.0
Explanation
Core Concept
AUG codes methionine, GCA codes alanine, and UGA is a stop codon that adds no amino acid — so the chain is two residues.
Correct Answer
A2
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