Which of the following best describes the prokaryotic flagellum?

• A. A short, hair-like structure involved in attachment
• B. A membrane-bound organelle responsible for energy production
• C. A longer whip-like structure used for movement
• D. A rigid structure that provides cell shape

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the structure and function of the prokaryotic flagellum. It is a cellular appendage found in many prokaryotes, primarily bacteria.
2. Step 2: Recall that the prokaryotic flagellum is not membrane-bound, unlike eukaryotic organelles, and it is involved in motility rather than attachment or energy production.
3. Step 3: Compare the options given: a short hair-like structure (likely referring to pili or fimbriae), a membrane-bound organelle (such as mitochondria, which prokaryotes do not have), a longer whip-like structure (flagellum), and a rigid structure providing shape (such as the cell wall).
4. Step 4: Recognize that the prokaryotic flagellum is a longer whip-like structure that rotates to propel the cell through its environment, enabling movement.
5. Step 5: Conclude that the best description of the prokaryotic flagellum is 'a longer whip-like structure used for movement.'