UPSC CSE Prelims
Question 64
Which of the following statements is/are correct?
- Viruses lack enzymes necessary for the generation of energy.
- Viruses can be cultured in any synthetic medium.
- Viruses are transmitted from one organism to another by biological vectors only.
Select the correct answer using the codes given below.
View correct answer and explanation
Correct answer: A
Correct Option: A
Explanation: Viruses depend on host cellular machinery for energy and reproduction. They cannot generally be cultured in inert media and can spread by several routes.
Statement/Pair-wise Analysis:
Statement/Item 1: Correct - Viruses lack a self-sufficient metabolic apparatus for energy production.
Statement/Item 2: Incorrect - Viruses require living host cells; ordinary synthetic culture medium alone cannot propagate them.
Statement/Item 3: Incorrect - Transmission can be airborne, by contact, blood, droplets or vectors-not solely through biological vectors.
Option-wise Analysis:
A: Correct - selects all and only the accurate statements/pairs.
B: Incorrect - includes false items 2, 3 and excludes true item 1.
C: Incorrect - includes false item 3.
D: Incorrect - includes false items 2, 3.