If the following DNA strand serves as the template strand fo

If the following DNA strand serves as the template strand for transcription, what is the third amino acid of the protein produced if translation starts at the first start cordon in the mRNA produced? 3\'-AATACGACGTACTTTCGAACACT-5\' a. Cys. b. Thr. c. His. d. Leu. e. Met.

Solution

Answer: c. His

Start codon of the mRNA in translation is AUG, codes methionine.

DNA: 3\'-AATACGACGTACTTTCGAACACT-5\'

mRNA: 5-UUAUG-CUG-CAU-GAAAGCUUGTGA-3\'

First codon: AUG= Methionine

Second Codon: CUG=Leucine

Thire codon: CAU=Histidine