Which of the following best describes the primary function of fimbriae in bacteria?

• A. Transfer of genetic material during conjugation
• B. Motility through flagellar movement
• C. Protection against phagocytosis
• D. Attachment to surfaces and host cells

Answer: (D)

Verified step by step guidance

1. Understand that fimbriae are hair-like appendages found on the surface of many bacteria.
2. Recall that fimbriae primarily function to help bacteria adhere to surfaces, including host tissues, which is crucial for colonization and infection.
3. Differentiate fimbriae from other bacterial structures: flagella are responsible for motility, pili (a type of fimbriae) can be involved in genetic material transfer during conjugation, and capsules help protect against phagocytosis.
4. Recognize that the primary role of fimbriae is not motility, genetic transfer, or protection, but attachment to surfaces and host cells.
5. Conclude that the best description of fimbriae's primary function is attachment, which facilitates bacterial colonization and infection.