Apentix/AP Biology/Unit 6: Gene Expression and Regulation/Question
AP Biologyeasymcq1 pt

During translation, what determines the specific order of amino acids joined into a polypeptide?

A.The relative abundance of each amino acid dissolved in the cytoplasm
B.The order of tRNA genes arranged along the cell's chromosome
C.The sequence of codons in the messenger RNA, read from the start codon toward the 3' end
D.The folding pattern the growing chain adopts inside the ribosome tunnel

Explanation

Core Concept

Ribosomes step along the mRNA in fixed three-base increments beginning at AUG. Each codon admits the tRNA whose anticodon pairs with it, and that tRNA donates its attached amino acid. The message's linear codon order is thereby copied directly into the growing chain.

Correct Answer

CThe sequence of codons in the messenger RNA, read from the start codon toward the 3' end

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