Cell Wall
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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show | A: Peptidoglycan (PTG)
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Q: What is the basic structure of peptidoglycan (PTG)? | show 🗑
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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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Q: The peptidoglycan (PTG) of gram negative bacteria can be found where? | show 🗑
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Q: True or false? In gram positive bacteria peptidoglycan (PTG) is sandwiched between an outer membrane and the cytoplasmic membrane. | show 🗑
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show | A: Secreted proteins and proteins of the ABC transport system.
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Q: The cell wall of gram negative bacteria has an outer membrane. What is it made of? | show 🗑
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show | A: Porins.
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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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Q: True or false? Lipid A is considered an endotoxin. | show 🗑
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show | A: Because lipid A is an endotoxin.
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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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show | A: Penicillin is more effective against gram positive due to increased concentration of peptidoglycan (PTG).
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show | A: False! There are Penicillin derivatives produced to protect against gram negative bacteria.
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show | A: Lysozymes are produced in many body fluids including tears and saliva.
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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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Q: If a bacterium lacks a cell wall, what is responsible for maintaining the cell shape? | show 🗑
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show | A: Mycoplasma.
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Q: Does Penicillin have any effect on mycoplasma? Why or why not? | show 🗑
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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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show | A: Glycocalyx (glyco = sugar / calyx = shell).
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show | A: The capsule and the slime layer.
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show | A: True!
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show | A: True!
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Q: Chemical composition of capsules and slime layers varies depending on bacterial species but most are made up of _______. | show 🗑
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This MICROBIOLOGY stack covers the section of chapter 3 entitled CELL WALL. | show 🗑
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PCC Microbiology
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