Chapter 2 (Test 2) Flashcards
1
Q
Endospores
A
Resistant to heat, chemicals, radiation, UV Survival structures Bacillus, Clostridium species No Archaea
2
Q
Endospore conversion back to
A
to vegetative cell
3
Q
Structure of the bacterial endospore
A
Spore coats-layers of spore-specific proteins Cortex-loose peptidoglycan Exosporium-thin protein covering Core-cell constituents DNA
4
Q
Chemical constituents of the bacterial endospore
A
- Dipicolinic acid-calcium complex in core
- Small acid-soluble proteins (SASPs)
5
Q
Dipicolinic acid-calcium complex in core
A
10% of spore Reduces water availability Increases heat resistance Increases chemical resistance Intercalates in DNA Prevents heat denaturation
6
Q
Small acid-soluble proteins (SASPs)
A
Bind DNA—UV, desiccation, dry heat
Carbon and energy source for outgrowth
7
Q
Gliding motility
A
Filamentous or rod-shaped cells:
Cyanobacteria—Polysaccharide secreted onto surface pulls cell along
Flavobacterium—Proteins on cell surface
8
Q
Microbial taxis
A
Movement towards or away from a an agent
Cell surface receptors
Chemotaxis of peritrichously flagellated cell
9
Q
Other taxes
A
Phototaxis—light
Osmotaxis—high ionic strength
Hydrotaxis—water
Aerotaxis—oxygen
