Consider the following statements about mutations: 1. Mutations can be caused by UV radiation. 2. All mutations result in a change in the protein sequence. 3. Mutations in germ cells are heritable. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about mutations:
1. Mutations can be caused by UV radiation.
2. All mutations result in a change in the protein sequence.
3. Mutations in germ cells are heritable.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 3 only
C. 2 and 3 only
D. 1 and 2 only
Answer: Option B
Solution (By JKSSB Mock Tests)
UV radiation can induce mutations; germline mutations are passed on. Not all mutations change protein sequence (silent mutations). So 2 is incorrect.
Explanation:
Autotrophs produce organic compounds from inorganic COâ‚‚ and water using light energy (photosynthesis). This exactly defines green plants. So both are true, and R explains A.
Consider statements about cell biology: 1. The cell membrane is selectively permeable. 2. The nucleus contains genetic material. 3. Mitochondria are the site of photosynthesis. Which are correct?
Explanation:
The cell membrane (plasma membrane) is selectively permeable, regulating the passage of substances in and out of the cell to maintain internal homeostasis. The nucleus is the membrane-bound organelle that houses the cell's genetic material (DNA) organized into chromosomes, directing cellular activities. Mitochondria are the site of aerobic cellular respiration and ATP production; chloroplasts are the organelles where photosynthesis occurs in plant cells. Thus, statements 1 and 2 are correct.
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