Microbiology Flashcards
1
Q
Gram + Cell Wall Structure
A
- 2-layers
- Thick
- NO porin channel
- NO periplasmic space
- Susceptible to breakdown by penicillins and lysozyme
- NO endotoxin
2
Q
Gram - Cell Wall Structure
A
- 3-layers
- Thin
- Porin channel
- Periplasmic space
- NOT susceptible to breakdown by penicillins and lysozyme
- Endotoxin (outer membrane)
3
Q
NUP and NUG are caused by what bacteria?
A
Treponema denticola
4
Q
Obligate Aerobes
A
- must have oxygen to survive
- have all enzymes
5
Q
Facultative Anaerobes
A
- can live and grow with or without oxygen
* MOST DISEASE-CAUSING ORGANISMS*
6
Q
Anaerobic Bacteria =
A
bacteria that do NOT live or grow when oxygen is present
7
Q
Aerobic Bacteria =
A
bacteria that require oxygen to live or grow
8
Q
Microaerophilic Bacteria
A
“aerotolerant anaerobes” - do NOT use oxygen at all, but they can survive in oxygen-rich environments
9
Q
Obligate Anaerobes
A
- CANNOT tolerate oxygen
* live in periodontal pockets AND sulcus*
10
Q
Lag Phase (#1)
A
“resting phase”
- growth is SLOW as bacteria acclimate to their environment
- CELLULAR METABOLIC ACTIVITY WAS NOT INCREASED DURING LAG PHASE*
11
Q
Logarithmic “exponential” Phase (#2)
A
- growth occurs “exponentially” (very rapidly)
* MICROORGANISMS ARE MOST PRONE TO BREAKDOWN BY ANTIMICROBIAL AGENTS*
12
Q
Stationary Phase
A
- no net increase or decrease in cell numbers; nutrients used up and waste products build up
13
Q
Death Phase
A
- microbes die off
14
Q
Streptococcus =
A
- spherical GRAM + cocci (chains or pairs)
- non-mobile
- microaerophilic (need oxygen)
- catalase negative
15
Q
3 groups of Streptococcus Bacteria
A
- Beta-hemolytic streptococcus *
- Alpha-hemolytic streptococcus
- Gamma-hemolytic streptococcus
