9
RCMultiple Choice

Unit Test — Cumulative exam

Question 9 • 2025-2026_MDCPS_2000315_Biology_1_A-CR

Which best describes a codon?

Answer
A
a cell structure that gives the master instructions for an organism
B
a segment of DNA that is the basis of heredity in organisms
C
the sequence of three bases that codes for a specific amino acid
D
the basic unit of structure and function of all living things

Explanation

A codon is a sequence of three bases in genetic material that specifies an amino acid (or, in some cases, a stop signal) during protein synthesis. Therefore, choice C, “the sequence of three bases that codes for a specific amino acid,” best describes a codon. The other choices describe a nucleus or DNA, a gene, and a cell, respectively.

AI-written and checked against the verified answer.

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