Question

what makes up a codon on an mrna strand?
○ a series of 3 amino acids
○ 1 nucleotide per amino acid
○ the nucleotide code for 3 different amino acids
○ 3 nucleotides that code for an amino acid

Explanation:

A codon is a specific sequence on mRNA that corresponds to an amino acid (or a stop signal). By definition, each codon consists of 3 consecutive nucleotide bases that code for one amino acid. The other options are incorrect: amino acids are the products of codon translation, not components of codons; a single nucleotide cannot code for an amino acid; one codon codes for one (or sometimes zero, for stop codons) amino acid, not three.

Answer:

3 nucleotides that code for an amino acid