18 Questions
What is the function of the outer membrane in Gram-negative bacteria?
Acts as a protective barrier against harmful substances
What is the role of Lipopolysaccharide (LPS) in Gram-negative bacteria?
Contributes to the structural integrity of the outer membrane
How do Gram-negative bacteria protect themselves from attack by most peptidases?
By incorporating D-amino acids into their peptidoglycan structure
What are porins in Gram-negative bacteria?
Proteins that form channels in the outer membrane for nutrient transport
What is the core polysaccharide component of Lipopolysaccharide (LPS) responsible for?
Attaching the LPS to the lipid A portion
How do Gram-negative bacteria protect themselves from harmful substances in their environment?
By utilizing porins for selective permeability
What is the function of the outer membrane in Gram-negative bacteria?
Barrier to certain substances like antibiotics and enzymes
What is the role of lipopolysaccharides (LPS) in the outer membrane of Gram-negative bacteria?
Helps in evading phagocytosis and complement actions
How does the outer membrane of Gram-negative bacteria affect antibiotic effectiveness?
Provides a barrier to certain antibiotics
What are porins and what is their function in the outer membrane of Gram-negative bacteria?
Proteins that form channels and permit passage of molecules
What is the function of the adhesion sites in the Gram-negative wall?
Strengthen the wall and hold the outer membrane in place
Why is the high concentration of degradative enzymes and transport proteins in the periplasm important?
Substances can move into the cell through the adhesion sites instead of the periplasm
What is the function of the outer membrane in bacteria?
Prevents loss of constituents like periplasmic enzymes
Which group of bacteria are able to survive without cell walls?
Mycoplasmas
What is the function of sterols in the cytoplasmic membranes of mycoplasmas?
Add strength and rigidity to the membrane
Which enzyme attacks peptidoglycan by hydrolyzing the bond that connects N-acetylmuramic acid with N-acetylglucosamine?
Lysozyme
What does penicillin inhibit in bacteria?
Peptidoglycan synthesis
What happens to Gram-positive bacteria when incubated with penicillin in an isotonic solution?
Converted to protoplasts that continue to grow normally
Learn about the structure of the Gram-negative bacterial cell wall, including the connection between the outer membrane and peptidoglycan. Explore the role of adhesion sites in strengthening the wall and maintaining membrane integrity.
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