What are the characteristics of Gram negative bacteria?
<span style="text-decoration:underline;">Thin </span>peptidoglycan layer
Periplasmic space- beta lactamase production occurs here 
No teichoic acid
Outer membrane- LPS, endotoxins are made here

What are the characteristics of gram positive bacteria?
<span style="text-decoration:underline;">Thick</span> peptidoglycan layer
No periplasmic space 
Teichoic acid- IgA protease
No outer membrane

Which organisms are opportunists (part of the normal flora)?
Staphylococcus aureus
Candida albicans
Enteric gram negative organisms (E. coli, Enterobacter, Klebsiella)
Enterococcus
Cytomegalovirus

Which pathogens <span style="text-decoration:underline;">always</span> cause disease?
Mycobacterium tuberculosis
Neisseria gonorrhoeae
Plasmodium
Rabies virus
Treponema pallidum