Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

8 Cards in this Set

  • Front
  • Back
Single circular db-stranded DNA
DNA supercoiled by gyrase
Not membrane bound
hydrophilic, polysaccharide, antigenic, anti-phagocytic, adherence/invasion
Mechanism to avoid elimination by host immune response, some bacteria can switch from production of one antigenic type to another
Phase variation
What is unique to gram + cell envelope
Peptidoglycan thick
Teichoic acid
Lipoteichoic acid: anchors CW to cell membrane
2 layers
What is unique to gram - cell envelope
-Peptidoglycan thin
-No teichnoic acid
-Peptidoglycan linked by lipoprotein to OM
-Periplasmic space contains enzymes
-OM contains LPS
Synthesis that occurs sequentially of peptidoglycan: in cytoplasm, CM, periplasm (gram -), or cell surface (gram +)
Vectorial synthesis
Outer membrane of gram - contains
LPS on outer leaflet

Phospholipid on inner leaflet
LPS structure (endotoxins)
Lipid A in OM
Core polysaccharide in IM
O antigen

all only on gram -