Which of the following statements about RNA is correct? MCQ with Answer and Explanation

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Which of the following statements about RNA is correct?

A. tRNA is the main component of ribosomes.

B. It contains the base thymine.

C. It is usually double-stranded.

D. mRNA carries the genetic message from DNA to ribosomes.

Answer: Option D

Solution (By JKExamLibrary)

mRNA is the template for translation. RNA is typically single-stranded, contains uracil, rRNA forms ribosome structure.

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Question #1

In ecology, the 'Competitive Exclusion Principle' (Gause's Law) states that:

A. Competition always leads to the extinction of both species

B. Two species competing for the exact same limited resource cannot coexist at constant population values

C. Two species can coexist indefinitely if they share the same niche

D. Predators will always outcompete their prey

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Correct Answer: Option B

Explanation:
The Competitive Exclusion Principle, formulated by G.F. Gause based on his experiments with Paramecium, states that two species with identical ecological niches (competing for the exact same limited resources) cannot coexist indefinitely in the same habitat. One species will inevitably have a slight reproductive advantage and will outcompete the other, leading to the local extinction or evolutionary shift (resource partitioning) of the inferior competitor.

This question belongs to: Science Biology

Question #2

Consider the following statements about the nervous system:
1. The central nervous system consists of the brain and spinal cord.
2. The peripheral nervous system includes cranial and spinal nerves.
3. The autonomic nervous system controls voluntary actions.
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 B

Explanation:
CNS = brain + spinal cord; PNS = nerves. Autonomic NS controls involuntary actions, so 3 is incorrect. Thus, 1 and 2 are correct.

This question belongs to: Science Biology

Question #3

In genetics, the phenomenon where the expression of one gene is masked or modified by the expression of another non-allelic gene is called:

A. Linkage

B. Pleiotropy

C. Penetrance

D. Epistasis

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Correct Answer: Option D

Explanation:
Epistasis is a form of gene interaction where the expression of one gene (the epistatic gene) masks, suppresses, or modifies the expression of another non-allelic gene (the hypostatic gene). This alters the expected Mendelian dihybrid ratio (9:3:3:1) into modified ratios like 9:7 (complementary), 9:3:4 (recessive epistasis), or 12:3:1 (dominant epistasis). Pleiotropy is one gene affecting multiple traits, and linkage is genes being on the same chromosome.

This question belongs to: Science Biology

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