The term for a sequence of three nucleotides on tRNA that is complementary to an mRNA codon is: MCQ with Answer and Explanation

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The term for a sequence of three nucleotides on tRNA that is complementary to an mRNA codon is:

A. Exon

B. Promoter

C. Anticodon

D. Codon

Answer: Option C

Solution (By JKExamLibrary)

The anticodon is a triplet of nucleotides on the tRNA molecule that base-pairs with the complementary codon on mRNA during translation, ensuring correct amino acid incorporation. Codons are on mRNA, promoters are DNA sequences for transcription initiation, exons are coding regions in eukaryotic genes.

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Question #1

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Assertion (A): Plants wilt in salty soil.
Reason (R): High salinity causes water to move out of root cells by osmosis.

A. A true, R false.

B. Both A and R are true, and R is the correct explanation.

C. A false, R true.

D. Both A and R are true, but R is not the correct explanation.

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Correct Answer: Option B

Explanation:
Saline soil has lower water potential, causing exosmosis from root cells, leading to plasmolysis and wilting. R correctly explains A.

This question belongs to: Science Biology

Question #2

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Consider the following statements about DNA fingerprinting:
1. It uses VNTRs (variable number tandem repeats).
2. It can be used in paternity testing.
3. It requires amplification by PCR.
Which of the above is/are correct?

A. 1 and 3 only

B. 1 and 2 only

C. 2 and 3 only

D. 1, 2, and 3

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Correct Answer: Option D

Explanation:
DNA fingerprinting analyzes VNTRs, often amplified by PCR, and is used in forensics and paternity. All three are correct.

This question belongs to: Science Biology

Question #3

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The 'Green Revolution' in India, which led to a massive increase in wheat and rice production, was primarily led by the efforts of:

A. Both B and C

B. Norman Borlaug

C. M.S. Swaminathan

D. Verghese Kurien

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Correct Answer: Option A

Explanation:
The Green Revolution in India was a period of significant agricultural transformation. Norman Borlaug, the 'father of the Green Revolution' globally, developed high-yielding, disease-resistant dwarf wheat varieties in Mexico. M.S. Swaminathan, known as the 'father of the Green Revolution in India', adapted these varieties to Indian conditions and led the scientific and administrative efforts to introduce these high-yielding varieties (along with improved irrigation and fertilizers) to Indian farmers, drastically increasing wheat and rice production.

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