To find out which codon codes for the amino acid histidine (His), we refer to the provided mRNA codon table. The mRNA codon table maps specific three-nucleotide sequences (codons) to their corresponding amino acids.
Looking through the table:
1. The amino acid "His" (histidine) is listed in the table.
2. According to the table, histidine (His) can be identified by the following codons:
- CAU
- CAC
Given the options provided:
A. CAA
B. CAU
C. AAC
D. UAC
We see that option B, which is CAU, corresponds to histidine (His).
Therefore, the codon for the amino acid histidine (His) is:
B. CAU
