22 - Microbial Cell Structure

Question 1

understand the membranes of bacteria?

Answer 1

plasma mem
cell wall
capsule
flagella

Question 2

what is the capsule made of?

Answer 2

a polysachhride gel

Question 3

capsule role?

Answer 3

protect adverse conditions

reduces opsonisation

Question 4

what is the glycocalyx?

Answer 4

glycoprotein/lipid

allows adherence to surfaces

Question 5

colour of gram pos and neg?

Answer 5

pos - purple

neg - pink

Question 6

composition of gram + bacteria?

Answer 6

thick layer of peptidoglycan

Question 7

composition of gram - bacteria?

Answer 7

has an outer layer

made of lipopolysachride [lipid and polys] [LPS]

Question 8

how does peptidoglycan structure of G+ and G- differ?

Answer 8

G+
- glycine linkages

G-
- variation of suGARS

Question 9

structure of LPS?

Answer 9

lipid
core polyscahride
O-specific polys

Question 10

role of fimbriae?

[type 1 fimb]

Answer 10

adherence to surfaces

Type 1 - attach to macrophages/neutrophils/T/Bcells to trigger immune resp

Question 11

structure of flagella?

Answer 11

• protein flaggelin
• if at one end of cell POLAR
• multiple is PERITICHOUS