Answer and explanation

Correct answer: A. A sequence of three bases in mRNA coding for an amino acid

  1. Step 1: Each codon of three mRNA bases specifies one amino acid or a stop signal. Answer: A sequence of three bases in mRNA coding for an amino acid. Why not the others: A sequence of two bases in DNA, A group of four amino acids and A sequence of three bases in rRNA only don't fit.

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