College

All bacteria are:

A. Microscopic, but not necessarily pathogenic.
B. Pathogenic, but not necessarily microscopic.
C. Neither pathogenic nor microscopic.
D. Both microscopic and pathogenic.

Answer :

Final answer:

All bacteria are microscopic, but only a small fraction are pathogenic, emphasizing the importance of non-pathogenic varieties in ecosystems.


Explanation:

Understanding Bacteria

Bacteria are microscopic, single-celled organisms classified as prokaryotes. Most bacteria are non-pathogenic, meaning they do not cause disease, while a small percentage are pathogenic, capable of causing illness in hosts. Thus, the statement that "All bacteria are microscopic, but not necessarily pathogenic" is correct.

It's important to recognize that while all pathogenic bacteria are microscopic, not all microscopic bacteria are pathogens. For instance, many bacteria play essential roles in processes such as decomposition and nutrient cycling in ecosystems.

Key Characteristics of Bacteria

  • Pathogenic bacteria can live free or within host tissues, while non-pathogenic typically thrive in communities.
  • Bacteria vary greatly in their function and effect on human health.

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