Cell Wall
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | A: Peptidoglycan (PTG)
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| show | A: An alternating series of two subunits, N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), which form two glycan chains. The two glycan chains are held together by a string of four amino acids.
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| Q: The cell wall of gram positive bacteria is made up of how many layers of peptidoglycan (PTG)? | show 🗑
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| show | A: Teichoic acid.
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| Q: The cell wall of gram negative bacteria is made up of how many layers of peptidoglycan (PTG)? | show 🗑
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| show | A: In a region between the outer membrane and the cytoplasmic membrane know as the periplasm.
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| show | A: False! This is true only of gram negative bacteria.
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| Q: Aside from the cell wall, what can be found in the periplasm? | show 🗑
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| show | A: The outer membrane (aka lipopolysaccharide layer or LPS layer) is a lipid bilayer made up of lipopolysaccharides.
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| Q: The outer membrane of the cell wall in gram negative bacteria serves as a barrier to large molecules but allows small molecules and ions through channels called _______. | show 🗑
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| Q: The outer cell membrane of gram negative bacteria has two portions, an inner and an outer. What are these portions called? | show 🗑
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| show | A: True!
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| Q: Whay are gram negative infections considered deadly? | show 🗑
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| show | A: Lipid A.
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| Q: Which part of the outer membrane is used to identify certin species or strains? | show 🗑
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| show | A: True!
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| Q: Is Penicillin better against gram positive or gram negative bacteria. | show 🗑
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| show | A: False! There are Penicillin derivatives produced to protect against gram negative bacteria.
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| Q: Name two places where lysozymes are produced. | show 🗑
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| show | A: Lysozymes destroy the integrity of the cell wall by breaking the bond linking NAG and NAM.
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| show | A: Protease and nuclease.
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| Q: What accounts for differences in staining characteristics of gram negative and gram positive bacteria? | show 🗑
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| show | A: Gram positive will be purple and gram negative will be pink.
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| show | A: False! Some bacteria naturally lack a cell wall.
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| show | A: Sterols in the membrane.
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| show | A: Mycoplasma.
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| show | A: No, because mycoplasma have no cell wall.
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| Q: True or false? Bacteria in domain Archae contain peptidoglycan. | show 🗑
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| Q: What causes the mild form of pneumonia known as "walking pneumonia"? | show 🗑
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| Q: Together, the two layers outside the cell wall are referred to as ______? | show 🗑
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| Q: There are two layers external to the cell wall of bacteria. What are they? | show 🗑
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| Q: True or false? Bacterial capsules are a distinct gelatinous layer. | show 🗑
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| show | A: True!
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| show | A: Polysaccharide.
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| This MICROBIOLOGY stack covers the section of chapter 3 entitled CELL WALL. | show 🗑
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Created by:
PCC Microbiology
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