Identify the correct statement about mutations: MCQ with Answer and Explanation

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Identify the correct statement about mutations:

A. All mutations are caused by radiation.

B. Mutations can be inherited if they occur in germ cells.

C. Mutations cannot be spontaneous.

D. Silent mutations always change the protein sequence.

Answer: Option B

Solution (By JKSSB Mock Tests)

Germline mutations can be passed to offspring. Mutations can be spontaneous or induced; silent mutations do not change the amino acid sequence.

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Question #1

The scientist who introduced the term 'biology' was:

A. Darwin

B. Linnaeus

C. Lamarck and Treviranus

D. Aristotle

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Correct Answer: Option C

Explanation:
The term 'biology' was independently coined by Jean-Baptiste Lamarck (France) and Gottfried Reinhold Treviranus (Germany) around 1802. Aristotle is father of biology, Linnaeus taxonomy, Darwin evolution.

This question belongs to: Science Biology

Question #2

Assertion (A): The cell membrane is described by the fluid mosaic model. Reason (R): The phospholipid bilayer is fluid, and proteins are embedded like a mosaic.

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

B. A is false, but R is true.

C. A is true, but R is false.

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

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Correct Answer: Option D

Explanation:
The fluid mosaic model, proposed by Singer and Nicolson in 1972, accurately describes the plasma membrane. The phospholipid bilayer has a fluid consistency, allowing lateral movement of lipids and proteins. Proteins float within or on this bilayer, forming a mosaic pattern. Thus, the reason correctly explains the assertion.

This question belongs to: Science Biology

Question #3

The hormone that relaxes the pubic symphysis during childbirth is:

A. Relaxin

B. Progesterone

C. Estrogen

D. Oxytocin

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Correct Answer: Option A

Explanation:
Relaxin, produced by the corpus luteum and placenta, softens and relaxes the pelvic ligaments and pubic symphysis to facilitate childbirth. Oxytocin stimulates contractions.

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