16 Questions
What is the outer leaflet of the outer membrane of Gram-negative bacteria mostly comprised of?
Lipopolysaccharide (LPS)
Which component of Lipopolysaccharide (LPS) anchors it in the outer membrane of Gram-negative bacteria?
Lipid A
What confers a negative charge to Lipid A in the outer membrane of Gram-negative bacteria?
Phosphates
What is another name for Lipid A, a prominent molecule in the outer membrane of Gram-negative bacteria?
Endotoxin
Which structure can be used to identify a bacterium?
O antigen
What serves to connect the outer membrane to the cell wall in Gram-negative cells?
Braun’s lipoprotein
What is the function of porins in the outer membrane?
Serve as channels for entrance/exit of small molecules
What is the function of the periplasm in Gram-negative bacteria?
Buffer between environment and cell
What is the function of S-layers in bacteria?
Can provide a periplasmic space or keep external proteins from accessing outer membrane or cell wall
What are capsules and slime layers composed of?
Polysaccharides
What are pili and fimbriae primarily composed of?
Protein
What is the function of fimbriae?
Mediates attachment to a surface or another cell
What is the function of conjugative pili?
Important for conjugation (transfer of genetic material between bacteria)
What is the function of Braun’s lipoprotein in Gram-negative cells?
Connects the outer membrane to the cell wall
What is the role of the outer membrane in bacteria?
Acts as a barrier and soaks up or blocks access to many molecules
What is the function of the periplasm in bacteria?
Contains many important proteins/functions such as detoxifying harmful compounds
Test your knowledge of bacterial cell envelopes and surface structures with this quiz. Explore the outer membranes of Gram-negative bacteria, periplasmic space, S-layers, capsules, and surface appendages. Perfect for students studying microbiology or cell biology.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
