Question

Virus are living, because :

• A. They multiply in host cells
• B. Carry anaerobic respiration
• C. Carry metabolic activity
• D. Cause infection

Answer 1

The Correct Option is A

To determine why viruses are considered living, we need to look at the specific property mentioned in the correct answer: "They multiply in host cells".

Explanation:

1. Characteristic of Life: In biology, a fundamental characteristic of living organisms is their ability to reproduce. Viruses exhibit this characteristic, but only when inside a host cell. They cannot multiply on their own outside of host cells.
2. Viral Reproduction: Once inside a host cell, viruses take over the cell's machinery to replicate their genetic material and produce more viral particles. This process is akin to reproduction in living organisms, albeit reliant on a host.

Evaluating the Other Options:

• Carry anaerobic respiration: This option is incorrect as viruses do not carry out any form of respiration, aerobic or anaerobic. They lack the necessary cellular structures and enzymes required for metabolism.
• Carry metabolic activity: This is incorrect because viruses do not perform metabolic activities. They rely entirely on the host cell's metabolic processes for replication.
• Cause infection: While causing infection is a characteristic of viruses, it does not classify them as living organisms. Non-living agents can also cause infections.

Conclusion: The statement "They multiply in host cells" is the key reason viruses are sometimes considered living. This reproductive capability, albeit dependent, is crucial in defining their living characteristics while within a host.