Which codons encode Histidine?

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Study for the Campbell Biology Concepts and Connections Test. Use flashcards and multiple choice questions, each with detailed explanations. Prepare thoroughly for your exam now!

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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