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Standard XII
Biology
Question

Assertion :Crick suggested for the first time requirement of 'adaptor' molecule for translation with polynucleotide chain having 75-85 bases. Reason: This molecule is able to represent one amino acid covalently linked to it and is also called as 'clover-leaf' molecule.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  3. Assertion is correct but Reason is incorrect.
  4. Both Assertion and Reason are incorrect.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Both Assertion and Reason are incorrect.
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Solution
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Francis Crick’s reasoned presence of the 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. The tRNA is called as adaptor molecule which helps to translates the nucleotide sequence of an mRNA into the amino acid sequence of a polypeptide. The assertion is correct. The tRNA carries covalently linked amino acid at its 3' end and anticodon loop that binds to particular triplet codon in mRNA. The amino acid forms the covalent bond with 2'/3' hydroxyl group of adenine residue at 3' end of tRNA. The presence of 3 loops and stems gives tRNA a clover leaf-like structure.
Thus, the correct answer is option B.

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Similar Questions
Q1
Assertion :Crick suggested for the first time requirement of 'adaptor' molecule for translation with polynucleotide chain having 75-85 bases. Reason: This molecule is able to represent one amino acid covalently linked to it and is also called as 'clover-leaf' molecule.
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Q2

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Q3

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Q4
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Q5

Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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