The first successfully cloned mammal, Dolly the sheep, was produced using: MCQ with Answer and Explanation

The first successfully cloned mammal, Dolly the sheep, was produced using:
A. Artificial insemination
B. Recombinant DNA technology
C. Somatic cell nuclear transfer
D. Gene therapy
Answer: Option C
Solution (By JKExamLibrary)
Dolly (1996) was created by somatic cell nuclear transfer (SCNT), where the nucleus from an adult somatic cell (udder) was transferred into an enucleated egg cell, which was then implanted in a surrogate. This proved that differentiated somatic cells can be reprogrammed to totipotency. She was the first mammal cloned from an adult cell.

This question belongs to: Science Biology

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Practice More Biology Questions

Question #1
The fluid that fills the anterior chamber of the eye is:
A. Synovial fluid
B. Aqueous humor
C. Vitreous humor
D. Cerebrospinal fluid

Correct Answer: Option B


Explanation:
Aqueous humor is a clear fluid in the anterior and posterior chambers of the eye, providing nutrients and maintaining intraocular pressure. Vitreous humor is the gel in the posterior segment.

This question belongs to: Science Biology
Question #2
Which of the following nitrogenous bases is found in RNA but not in DNA?
A. Adenine
B. Cytosine
C. Guanine
D. Uracil

Correct Answer: Option D


Explanation:
RNA contains uracil instead of thymine found in DNA. In DNA, adenine pairs with thymine; in RNA, adenine pairs with uracil. Adenine, guanine, and cytosine are common to both. Uracil is a pyrimidine base, structurally similar to thymine but lacking a methyl group. This distinction is used in genetic material identification and understanding transcription.

This question belongs to: Science Biology
Question #3
The plant response to touch, such as the closing of Mimosa pudica leaves, is:
A. Phototropism
B. Thigmotropism
C. Geotropism
D. Thigmonasty

Correct Answer: Option D


Explanation:
Thigmonasty (seismonasty) is a non-directional, rapid response to touch or vibration, exemplified by the drooping of Mimosa pudica leaves. Thigmotropism is directional growth towards/away from touch (e.g., tendrils). Phototropism is light-directed growth, geotropism gravity-directed.

This question belongs to: Science Biology

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