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The first amino acid incorporated at the N-terminus of polypeptide is ___________________(a) methionine(b) cysteine(c) tryptophan(d) valineThis question was posed to me in an online quiz.This is a very interesting question from Gene Expression topic in division Gene Expression of Cell Biology

Answer»

Right CHOICE is (a) METHIONINE

The explanation: The INITIATION codon AUG, CODES for the AMINO acid methionine. It is the first amino acid to be incorporated at the N-terminus of a nascent polypeptide, in bacteria it is formylmethionine.



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