Questions: Which of the following describes a single, polar flagellum? Lophotrichous Monotrichous Amphitrichous Peritrichous

The answer is the second one (Monotrichous): a single, polar flagellum.

Explanation for each option:

• Lophotrichous: This describes bacteria that have a cluster of flagella at one or both ends. It does not refer to a single flagellum.

• Monotrichous: This term describes bacteria that have a single flagellum located at one pole. This is the correct description for a single, polar flagellum.

• Amphitrichous: This describes bacteria that have a single flagellum at each pole. It involves two flagella, not a single one.

• Peritrichous: This describes bacteria that have flagella distributed over the entire surface of the cell. It does not refer to a single, polar flagellum.

In summary, a single, polar flagellum is best described by the term "Monotrichous."