Bacterial structures Flashcards
1
Q
Chemical composition:
- Sugar bacbone with peptide side chains crosslinked by transpeptidase
Function:
- Gives rigid stupport, protects against osmotic pressure
Define structure
A
Peptidoglycan
2
Q
Chemical composition:
- Peptidoglycan for support
- Lipoteichoic acid induces TNF and IL-1
Function:
- Major surface protein
Define structure
A
Cell wall/cell membrane (gram positives)
3
Q
Chemical composition:
- Lipid A induces TNF and IL-1
- O polysaccharide is the antigen
Function:
- Site of endotoxin (lipopolysaccharide (LPS))
- major surface antigen
Define structure
A
Outer membrane (Gram negative)
4
Q
Chemical composition:
- Phospholipid bilayer
Function:
- Site of oxidative and transport enzymes
Define structure
A
Plasma membrane
5
Q
Chemical composition:
- 50 S and 30 S subunits
Function:
- Protein syntheisis
Define structure
A
Ribosome
6
Q
Chemical composition:
- Contains many hydrolytic enzymes
- including B-lactamase
Function:
- space b/t the cytoplasmic membrane and out membrane in gram negative bacteria
Define structure
A
Periplasm
7
Q
Chemical composition:
- Polysaccharide (except Bacillus anthracis which contains D-glutamate)
Function:
- Protects agianst phagocytosis
Define structure
A
Capsule
8
Q
Chemical composition:
- Glycoprotein
Function:
- Mediate adherence of bacteria to cell surface
- sex pilus forms attachement b/t 2 bacteria during conjucation
Define structure
A
Pilus/Fimbria
9
Q
Chemical composition:
- Protein
Function:
- Motility
Define structure
A
Flagellum
10
Q
Chemical composition:
- Keratin-like coat
- dipicolinic acid
- peptidoglycan
Function:
- Resistant to dehydration, heat and chemicals
Define structure
A
Spore
11
Q
Chemical composition:
- DNA
Function:
- Contains variety of genes for antibiotic resistance, enyzmes, and toxins
Define structure
A
Plasmid
12
Q
Chemical composition:
- Polysaccharide
Function:
- Mediates adherence to surfaces, especially foreign surfaces (e.g. indwelling catherters)
Define structure
A
Glycocalyx
