Single Choice

Which of the following is correct regarding genetic code?

AUUU is the initiation codon which also codes for phenylalanie.
BThere are $$64$$ triplet codons and only $$20$$ amino acids.
Correct Answer
CThree random nitrogen bases specify the placement of one amino acid.
DUAA is the nonsense codon which also codes for methionine.

Solution

There are $$64$$-triplet codons which code for $$20$$ amino acids. This is due to the degeneracy of code as some amino acids are influenced by more than one codon. Only tryptophan and methionine are specified by single codons. All other amino acids are specified by two (e.g., phenylalanine-UUU, UUC) to six (e.g., arginine- CGU, CGC, CGA, CGG, AGA, AGG) codons.

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