Question

Assertion: In prokaryotes, there are three initiation factors used for protein synthesis.
Reason: All the initiation factors have their own functions.

• A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
• B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
• C. If the assertion is true but the reason is false
• D. If both the assertion and reason are false
• E. If the assertion is false but reason is true

Answer 1

Answer: (A)

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

In prokaryotes, three initiation factors are present - IF1, IF2, IF3. All three factors are essential for initiation when natural mRNA are used as templates. IF3 binds to the 30 S ribosomal subunit and is required for its binding to the mRNA starting site. IF3 also functions as a ribosome dissociation factors. IF2 binds the initiator f Met- tRNA and carries it to the ribosome (together with GTP) in response to the first AUG codon. IF1 participates in the interaction between IF2 and the initiator tRNA.

So, the correct option is A.