Assertion :Crick suggested for the first time, the requirement of 'adaptor' molecule for translation with polynucleotide chain having 75-85 bases. Reason: It will synthesize inducible enzymes.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Francis Crick’s reasoned presence of small nucleic acid as an adaptor to translate the 4-letter language of nucleic acids into the 20-letter language of proteins. For the purpose, one part of the adaptor molecule binds to a specific amino acid and another part identify the amino acid coding nucleotide sequence in mRNA. As we know that tRNA adaptor “translates” the nucleotide sequence of an mRNA into the amino acid sequence of a polypeptide. The tRNA has amino acid at its 3' end and anticodon loop that binds to particular triplet codon in mRNA. Assertion is correct. Inducible enzymes that are synthesized in response to particular condition or requirement, not expressed all time as do the constitutive enzymes. Enzymes synthesized by lac operon are inducible and are synthesized only in presence of lactose. Reason is correct but is not explanation for assertion.

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