7.1 Bacterial Basics Flashcards Preview

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Flashcards in 7.1 Bacterial Basics Deck (20):
1

What color do G+/G- stain?

G+ blue/purple (positive=purple)
G- pink

2

Describe the cell structure of G+

Cellular membrane
Cellular envelope
THICK CELL wall, made from peptidoglycan (NAG/NAM)

3

Describe the cell structure of G-

Cellular membrane
Cellular envelope
Thin cell wall, made from peptidoglycan
OUTER MEMBRANE- has porins, made of lipopolysaccharide, toxic to HBs

4

How are peptidoglycan organized?

NAG/NAM- polymers cross-linked with Penicillin-binding proteins (PBPs)

5

What are the G+ bacilli?

Coronybacterium
Clostridium difficile
Listeria
Bacillus

6

How are G+ cocci subdivided?

Catalase +/-

7

What are the catalase + G+ bugs?

Staphylococcus
S. aureus (Coagulase +; fibrinogen-> fibrin)
S. epidermitis
S. saphrophyticus

8

What are the catalase- G+ bugs?

Streptococcus

9

What do alpha, beta, gamma hemolytic mean?

B- (clear) lyses RBCs
A- (green) oxidizes Fe+
G- No change to agar

10

What are the beta hemolytic streptococci?

Pyrogenes- bacitracin sensitive

11

What are the gamma hemolytic streptococci?

Enterococcus
E. faecalis
E. fecium

12

What are the alpha hemolytic streptococci?

Strep. pneumoniae
Strep. viridians

13

What are the G- cocci?

Neisseria
Meningitis/ghonorrhea

14

What are the G+ coccobacilli?

H. influenzea
B. pertussis
L. pneumoniae

15

How are G- bacilli subdivided?

Lactose +/-

16

What are the lactose + G-?

E. coli
Enterobacter
Klebsellia

17

How are lactose- G- subdivided?

Oxidase +/-

18

What are the oxidase+ G-?

V. cholerae
PSEUDOMONAS aeroginosa

19

What are the oxidase- G-?

P. mirabilis
H. pylori

20

What is a strict anaerobe G-?

B. fragilis