Which of the following is false about fimbriae?
a. They are composed of protein.
b. They may be used for attachment.
c. They are found on gram-negative cells.
d. They are composed of pilin.
e. They may be used for motility.

Verified step by step guidance

1. Identify the function and composition of fimbriae in bacterial cells.
2. Understand that fimbriae are primarily used for attachment to surfaces, not for motility.
3. Recognize that fimbriae are composed of protein subunits called pilin.
4. Note that fimbriae are commonly found on gram-negative bacteria.
5. Determine which statement does not align with the known characteristics of fimbriae, focusing on their function and composition.

Key Concepts

Fimbriae Structure

Fimbriae are thin, hair-like appendages found on the surface of many bacteria, primarily composed of a protein called pilin. They are distinct from flagella, which are used for motility, and are typically shorter and more numerous. Understanding their structure is essential for recognizing their functions in bacterial physiology.

Function of Fimbriae

Fimbriae play a crucial role in the attachment of bacteria to surfaces, including host tissues, which is vital for colonization and infection. They can also contribute to biofilm formation, enhancing bacterial survival in various environments. This attachment capability is a key aspect of their biological significance.

Gram-Negative Bacteria

Gram-negative bacteria are characterized by a thin peptidoglycan layer surrounded by an outer membrane, which often contains lipopolysaccharides. Fimbriae are commonly found on these bacteria, aiding in their ability to adhere to surfaces and evade the immune response. Understanding the structural differences between gram-positive and gram-negative bacteria is important for microbiological studies.