16 Questions
What is the primary function of the bacterial cell wall?
Prevent cells from bursting due to osmotic pressure
What is the main structural component of bacterial cell walls?
Peptidoglycan
Which type of bacteria has a thick cell wall and no outer membrane?
Gram-positive bacteria
What is the sugar backbone of peptidoglycan comprised of?
Alternating N-Acetylglucosamine (NAG) & N-Acetylmuramic Acid (NAM)
What is the primary linkage connecting the N-acetylglucosamine (GlcNAc, NAG) and N-acetylmuramic acid (MurNAc, NAM) in peptidoglycan chains?
β(1,4) linkage
Which type of bacteria typically has a thicker peptidoglycan layer?
Gram-positive
What provides additional strength to the Gram-negative bacterial envelope?
Outer membrane
Which type of bacteria has interbridges to help connect different peptidoglycan layers?
Gram-positive
What is the function of teichoic acids in Gram-positive cell walls?
Provide cell strength
What do wall-associated proteins in Gram-positive bacteria typically do?
Assist in cell adhesion
What happens to the pores in Gram-positive cell walls during dehydration?
They close and prevent escape of crystal violet dye
What is the primary reason for Mycoplasma pneumoniae being considered an unusual bacterium?
Lack of cell wall
What happens to the color of Gram-negative bacteria after the decolorizing step in Gram staining?
They remain pink
What is the role of teichoic acids in Gram-positive cell walls?
Trap divalent metal ions
What is the primary function of the outer membrane in Gram-negative bacteria?
Serve as a permeability barrier
What is the specific sequence of the peptide in peptidoglycan for a given bacterium?
Conserved sequence
Test your knowledge of bacterial cell walls with this quiz! Explore the structure, function, and importance of cell walls in bacterial cells, and gain a deeper understanding of their role in maintaining cell integrity and shape.
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