Question

Which of the following reproduces only inside a host cell?

• A. Bacteria
• B. Virus
• C. Amoeba
• D. Fungus

Answer 1

The correct option is B

Virus

The correct option is B.

Explanation for correct option:

1. Viruses reproduce inside a host cell. Viruses replicate by lysogenic and lytic cycle.
2. In the lytic cycle, the virus attaches itself to the host cell and injects its DNA.
3. The viral DNA begins to replicate and form proteins, using the host's cellular metabolism.
4. These viruses break and spread to other cells of the body to continue the cycle.
5. A lysogenic virus remains inactive for a period of time. In the lysogenic cycle, the viral DNA gets integrated with the host's DNA and gets copied when the host cell replicates. Is infected with the virus DNA.

Explanation for incorrect options:

Option A

1. Bacteria reproduce through binary fission.
2. In this process, bacteria divide into two similar daughter cells.

Option C

1. Amoeba reproduces asexually through binary fission
2. in this a single cell amoeba divides itself into two cells that are identical, in favorable conditions.

Option D

1. Fungus reproduces asexually and sexually both.
2. It reproduces asexually through fragmentation, budding, or producing spores.
3. While sexual reproduction involves mating between two haploid hyphae.

Final answer: Virus reproduces inside the host cell.