Question 14

Viruses lack their own metabolic pathways and can only reproduce inside a host cell.

Viruses are unique microorganisms that cannot perform metabolic functions independently; they require a host cell to replicate and propagate.

A) Bacteria

Bacteria are prokaryotic microorganisms that possess their own metabolic pathways, allowing them to survive and reproduce independently in various environments. Unlike viruses, bacteria can grow and divide outside of host cells.

B) Viruses

Viruses are characterized by their inability to carry out metabolic processes on their own and must invade host cells to replicate. This distinctive feature sets them apart from other microorganisms, confirming that they are the correct answer.

C) Protozoa

Protozoa are single-celled eukaryotic organisms that have their own metabolic pathways and can reproduce independently. They thrive in diverse environments and do not require a host cell for reproduction, which makes this option incorrect.

D) Muscle

Muscle is not a microorganism; it refers to a type of tissue in animals composed of cells that facilitate movement. Since it does not fit the category of microorganisms, this option is irrelevant to the question.

Conclusion

Viruses definitively lack their own metabolic pathways and rely entirely on host cells for reproduction, making them the correct answer. In contrast, bacteria and protozoa can operate independently, and muscle is unrelated to the context of microorganisms. Thus, the unique reproductive nature of viruses establishes their correct classification in this question.