Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

The codons for the various amino acids are given below. Answer the question.

What will be the number of amino acids in a polypeptide chain formed from the RNA with the given codons?

AUG GUU GCA CGU UAA AAU AAG

Options:

6

7

4

5

Correct Answer:

4

Explanation:

The correct answer is Option (3) → 4

RNA sequence: AUG GUU GCA CGU UAA AAU AAG

  1. AUG: Start codon (Methionine)
  2. GUU: Valine
  3. GCA: Alanine
  4. CGU: Arginine
  5. UAA: Stop codon (This signals the termination of translation)

Any codons after the stop codon (in this case, AAU AAG) will not be translated into amino acids, as translation stops at the stop codon UAA.

The polypeptide will have 4 amino acids (Methionine, Valine, Alanine, Arginine) before the stop codon.