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Each of the codons specifies a particular amino acid. Using Table 21.6, we write a peptide with the following amino acid sequence.
The genetic code consists of sets of three nucleotides (triplets) in mRNA called codons that specify the amino acids and their sequence in the protein.
There is a different codon for all 20 amino acids needed to build a protein.
The genetic code
has stop signals, UGA, UAA, and UAG, that signal the termination of protein synthesis.
has a start codon, AUG, that signals the start of protein synthesis.
To determine the amino acid sequence coded in the following section of an mRNA,
5′ CCU AGC GGA CUU 3′
1. refer to the genetic code for the identity of the amino acids
CCU = Proline AGC = Serine
GGA = Glycine CUU = Leucine
2. mRNA section codes for the amino acid sequence are written in the following order:
Pro—Ser—Gly—Leu
