7
lesson pretestMultiple Choice

Pretest

Question 7 • CMS 2026-2027 Biology CREDIT RECOVERY

A point mutation changes the DNA sequence CGA to CGT, but the same protein is still produced. Which point mutation occurred?

Answer
A
frameshift
B
missense
C
silent
D
nonsense

Explanation

The DNA triplets CGA and CGT differ by one base, but both code for the same amino acid: arginine. Since the protein’s amino acid sequence does not change, this is a silent mutation. A missense mutation changes an amino acid, while a nonsense mutation creates a stop signal.

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