Question

Assertion (A): UAA, UAG and UGA codons on mRNA terminate protein synthesis.

Reason (R): These codons are not recognised by tRNA.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

Explanation:

Both statements are true. Stop codons have no corresponding tRNAs; release factors recognise them and bring translation to an end.