Question

In correct order, what are the nitrogen bases in the initiation code for a peptide chain?

A. adenine, thymine, and cytosine (ATC)
B. adenine, cytosine, and thymine (ACT)
C. cytosine, guanine, and thymine (CGT)
D. thymine, adenine, and cytosine (TAC)

Answer 1

D. thymine, adenine, and cytosine (TAC)

Step-by-step explanation:

DNA gets synthesised into an mRNA which gets synthesised into a peptide chain and eventually forms a protein.

In order to know where to begin joining up a peptide chain from amino acids, the protein-synthesis machinery searches for a start codon.

This is the three bases AUG, which code for the amino acid methionine.

Since the start codon in an mRNA is AUG, that means in the DNA, the initiation code will be complementary, so it will be TAC.