Assertion (A): Restriction enzymes are used in recombinant DNA technology. Reason (R): They cut DNA at specific recognition sequences. MCQ with Answer and Explanation

Question

Assertion (A): Restriction enzymes are used in recombinant DNA technology.
Reason (R): They cut DNA at specific recognition sequences.

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

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

C. A true, R false.

D. A false, R true.

Answer: Option B

Solution (By JKSSB Mock Tests)

Restriction endonucleases cut DNA at specific palindrome sequences, generating sticky or blunt ends, which can be ligated to vector DNA. This is the basis of genetic engineering. R explains A.

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Bt cotton is genetically modified to resist:

A. Drought

B. Bollworm pests

C. Salinity

D. Herbicides

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Correct Answer: Option B

Explanation:
Bt cotton contains cry genes from Bacillus thuringiensis, producing insecticidal proteins toxic to bollworms, reducing pesticide use.

This question belongs to: Science Biology

Question #2

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The vitamin that acts as a coenzyme in the synthesis of DNA and red blood cells is:

A. Vitamin A

B. Vitamin C

C. Vitamin K

D. Vitamin B₁₂

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Correct Answer: Option D

Explanation:
Vitamin B₁₂ (cobalamin) is required for DNA synthesis and RBC maturation. Deficiency causes pernicious anemia. It also maintains myelin sheath.

This question belongs to: Science Biology

Question #3

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The botanical name of neem is:

A. Azadirachta indica

B. Ocimum sanctum

C. Mangifera indica

D. Ficus religiosa

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Correct Answer: Option A

Explanation:
Azadirachta indica is the scientific name of neem, known for its medicinal and insecticidal properties. Ocimum sanctum is holy basil (tulsi), Ficus religiosa is the peepal tree, and Mangifera indica is mango. Neem belongs to the family Meliaceae. Its leaves, seeds, and oil are used in various traditional remedies and biopesticides.

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