Which codons encode Histidine?

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Multiple Choice

Which codons encode Histidine?

Explanation:
Histidine is specified by two codons in the standard genetic code: CAU and CAC. Codons are three-nucleotide sequences that encode amino acids, and for histidine the first two bases are fixed as CA while the third base can be either U or C, giving CAU and CAC. The other combinations mix histidine with codons that code for different amino acids (CAG codes for glutamine; CGA codes for arginine), so they don’t both encode histidine.

Histidine is specified by two codons in the standard genetic code: CAU and CAC. Codons are three-nucleotide sequences that encode amino acids, and for histidine the first two bases are fixed as CA while the third base can be either U or C, giving CAU and CAC. The other combinations mix histidine with codons that code for different amino acids (CAG codes for glutamine; CGA codes for arginine), so they don’t both encode histidine.

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