A group of three nucleotides on mRNA that codes for a specific amino acid.

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Multiple Choice

A group of three nucleotides on mRNA that codes for a specific amino acid.

Explanation:
The unit of three nucleotides on mRNA that specifies a particular amino acid is a codon. During translation, the ribosome reads mRNA codons in sequence, and each codon directs which amino acid should be added next to the growing protein. The codon is recognized by the anticodon on tRNA, which brings the correct amino acid to the ribosome. The anticodon is on the tRNA and pairs with the codon, but the three-nucleotide group on mRNA itself is the codon, not the anticodon. The mRNA carries the message of successive codons, while tRNA is the adaptor molecule that delivers amino acids. Start and stop codons are special codons that mark the beginning and end of translation.

The unit of three nucleotides on mRNA that specifies a particular amino acid is a codon. During translation, the ribosome reads mRNA codons in sequence, and each codon directs which amino acid should be added next to the growing protein. The codon is recognized by the anticodon on tRNA, which brings the correct amino acid to the ribosome. The anticodon is on the tRNA and pairs with the codon, but the three-nucleotide group on mRNA itself is the codon, not the anticodon. The mRNA carries the message of successive codons, while tRNA is the adaptor molecule that delivers amino acids. Start and stop codons are special codons that mark the beginning and end of translation.

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