A. Polypeptide synthesis stops when a termination codon reaches A-site.
B. The termination codon attracts AA-tRNA.

Both statement A and B are correct, and B is the correct reason for A.

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Both statement A and B are correct, but B is not the correct reason for A.

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Only statement A is correct.

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Only statement B is correct.

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Solution

The correct option is C Only statement A is correct.
Polypeptide synthesis stops when a nonsense or termination codon (UAA, UAG or UGA) reaches A-site. The termination codon does not attracts AA-tRNA. P-site tRNA separates from its amino acid in the presence of release factor eRF₁ in eukaryotes. The completed polypeptide is released, mRNA and ribosomes separates. The two subunits of ribosomes also dissociate with the help of dissociation factor.

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Q. Statement A - Polypeptide synthesis stops when a termination codon is read at the A-site.
Statement B - The termination codon attracts AA-tRNA.

Assertion and Reason
In the following questions a statement of assertion (A) followed by a statement reason (R) is given. Choose the correct answer out of the following choice..
(a) Assertion and reason both are correct statements but reason does not explain assertion.
(b) Assertion and reason both are correct and reason explains asssWon.
(c) Both assertion and reason are Wrong statements.
(d) Assertion is correct statement reason is wrong statement.
(e) Assertion is wrong statement reason is correct statement.

Assertion (A) Enzymes have active sites that hold substrate molecule for a chemical reaction.
Reason (R) Drugs compete with natural substrate by attaching covalently to the active site of enzyme.

Assertion (A) For making rubber synthetically, isoprene molecules are polymerised.

Reason (R) Neoprene (a polymer of chloroprene) is a synthetic rubber.

(a) Assertion and Reason both are correct statement But reason does not explain Assertion.

(b) Assertion and Reason both are correct statement and Reason explains the Assertion.

(d) Assertion is correct statement and Reason is wrong statement.

(e) Assertion is wrong statement and reason is correct statement.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements an Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) The packing efficiency is maximum for the fcc structure.

Reason (R) The coordination number is 12 in fcc structures.

Assertion (A) Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes.
Reason (R) In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.

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A. Polypeptide synthesis stops when a termination codon reaches A-site. B. The termination codon attracts AA-tRNA.

A. Polypeptide synthesis stops when a termination codon reaches A-site.
B. The termination codon attracts AA-tRNA.