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Flashcards in bacterial cell structure Deck (15)
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1

what is a prokaryocyte

a cell lacking a nucleus and other membrane bound organelles
includes bacteria and cyanobacteris

2

what is a spirochete bacterial cell

corkscrew shaped

3

pleomorphic

bacteria of various shapes

4

capsule or slime layer

glycocalyx
- adherence, physical barrier
- rigid structure= capsule
- resists phagocytosis
- loose structure= slime layer

5

gram positive cell wall

thick peptidoglycan layer
contains techoic acid- negative charge, antigenic
stains purple

6

gram negative cell wall

thin peptidoglycan layer
porins
outer membrane

7

outer membrane is composed of what

LPS= endotoxin

8

LPS structure

lipid A (toxic part)
core polysaccharide
O specific polysaccharide

9

what is an acid fast cell wall

group of microbes that do not readily take up stain

10

what genu of bacteria are all acid fast

myobacterium

11

what genu of bacteria lack a cell wall

mycoplasma
- therefore not susceptible to antibiotics that inhibit cell wall synthesis

12

what are mesosomes

invaginations of the cytoplasmic membrane that can form into vesicles
found in both gram positive and negative
increases surface area

13

what is the periplasmic space

space between inner and outer membranes in gram negative cells

14

what is a nucleoid

contains dna
bacterial chromosomes are mostly circular, some linear

15

what is a plasmid

small extrachromosomal dna