Question

How many amino acids will present in the protein coded by a mRNA , consisting of total 429 nucleotides and U,A and A nucleotides at 151 ,152 and 153 positions respectively. options are a) 143. b)428. c)142. d)50​

Answer 1

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☆ In the given mRNA strand, the 7th , 8th and 9 th position is marked by UAG codon which is a stop codon that stops the amino acid polymerization to a polypeptide.

☆ Therefore, the addition of adenosine residue after the 12th nucleotide will not make any reading shift before it.

☆ Hence, the given mRNA will be translated only till 9th nucleotide and accordingly, only two amino acids will be coded.

☆Hence, the correct answer is '143'.

✍️ Ⓣhank Ⓨou ‼️

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