Which of the following pairs codes for glycine?

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Multiple Choice

Which of the following pairs codes for glycine?

Explanation:
Glycine is encoded in messenger RNA by four codons: GGU, GGC, GGA, and GGG. The tRNA that recognizes these codons has anticodons that are complementary to them. Those anticodons are CCA, CCG, CCT, and CCC (written in the usual orientation for anticodons). So any pair drawn from these anticodons would code for glycine because they pair with the glycine codons. The pair CCC and CCT fits this idea, since CCC pairs with GGG and CCT pairs with GGA, both glycine codons. The other option includes a sequence (CAA) that does not pair with a glycine codon, so it wouldn’t code for glycine.

Glycine is encoded in messenger RNA by four codons: GGU, GGC, GGA, and GGG. The tRNA that recognizes these codons has anticodons that are complementary to them. Those anticodons are CCA, CCG, CCT, and CCC (written in the usual orientation for anticodons). So any pair drawn from these anticodons would code for glycine because they pair with the glycine codons.

The pair CCC and CCT fits this idea, since CCC pairs with GGG and CCT pairs with GGA, both glycine codons. The other option includes a sequence (CAA) that does not pair with a glycine codon, so it wouldn’t code for glycine.

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