Skip to main content
Back

Bacterial Cell Wall Structures and Gram Staining

Control buttons has been changed to "navigation" mode.
1/18

Terms in this set (18)

  • Does Gram-positive bacteria have a cell wall?
    Yes, Gram-positive bacteria have a cell wall.
  • Does Gram-positive bacteria have an outer membrane?
    No, Gram-positive bacteria do not have an outer membrane.
  • Does Gram-positive bacteria have teichoic acids?
    Yes, Gram-positive bacteria contain teichoic acids in their cell wall.
  • Does Gram-negative bacteria have a cell wall?
    Yes, Gram-negative bacteria have a cell wall.
  • Does Gram-negative bacteria have an outer membrane?
    Yes, Gram-negative bacteria have an outer membrane.
  • Does Gram-negative bacteria have LPS?
    Yes, Gram-negative bacteria have lipopolysaccharide (LPS) in their outer membrane.
  • What is LPS also called?
    LPS is also called endotoxin.
  • Why are Gram-negative bacteria more resistant to antibiotics?
    Because of their outer membrane which acts as a barrier.
  • What special substance is found in acid-fast bacterial cell walls?
    Acid-fast bacteria have mycolic acid in their cell walls.
  • Why are acid-fast bacteria hard to stain?
    Because of their waxy cell wall containing mycolic acid.
  • Why can acid-fast bacteria be difficult to treat?
    Their waxy cell wall provides protection, making treatment difficult.
  • Does Mycoplasma have a cell wall?
    No, Mycoplasma bacteria do not have a cell wall.
  • What does Mycoplasma have in its membrane?
    Mycoplasma membranes contain sterols.
  • Why is Mycoplasma resistant to penicillin?
    Because it lacks a cell wall, penicillin is ineffective.
  • What does a Gram stain separate bacteria by?
    Gram stain separates bacteria based on their cell wall structure.
  • What is the mordant in Gram staining?
    The mordant is iodine, which fixes the dye.
  • What is the counterstain in Gram staining?
    The counterstain is safranin.
  • Why are Gram stains useful for infections?
    They help identify bacteria and guide appropriate treatment.