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Microbiology > Bacteria Symposium > Flashcards

Bacteria Symposium Flashcards

1
Q

Pathogen

A

Organism that causes or is capable of causing disease

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2
Q

Commensal

A

Organism which colonises the host but causes no disease in normal circumstances

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3
Q

Opportunist Pathogen

A

Microbe that only causes disease if host defences are compromised

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4
Q

Virulence / Pathogenicity

A

The degree to which a given organism is pathogenic

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5
Q

Asymptomatic carriage

A

When a pathogen is carried harmlessly at a tissue site where it causes no disease

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6
Q

What colour do gram positive bacteria stain?

A

Purple

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7
Q

What colour do gram negative bacteria stain?

A

Red

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8
Q

A typical bacteria cell wall has…

A

Cell wall
1 or 2 cell membranes
Covalently closed chromosome (circular, double stranded)
Capsule

Some bacteria have flagella, pili/fimbriae

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9
Q

How many membranes does a gram positive bacteria have?

A

1

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10
Q

A gram positive bacteria has a capsule, peptidoglycan, lipoteichoic acid and c_____ m______

A

cytoplasmic membrane

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11
Q

Gram negative bacteria

A

Have lipoproteins and lipopolysaccharide (endotoxin)

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12
Q

Gram +ve vs gram -ve bacteria

A
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13
Q

What are the 2 main toxins made by bacteria?

A

Endotoxin and exotoxin

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14
Q

Endotoxin - component of the outer m_____ of bacteria and give an example

A

membrane
lipopolysacchardie in gram negative bacteria

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15
Q

Extoxin - secreted proteins of g__ p_____ and g___ n_____ bacteria

A

gram positive, gram negative

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16
Q

How do bacteria swap genetic information with each other?

A

Bacterial conjugation via sex pilus

17
Q

Gene transfer can occur via plasmid in process called t______

A

transformation

18
Q

What is the process of gene transfer via phage in bacteria?

A

Transduction

19
Q

Give examples of obligate intracellular bacteria?

A

Rickettsia, Chlamydia, Coxiella

20
Q

Bacteria that may be cultured on an artificial media can be divided into those with and those without a…

A

cell wall

21
Q

Bacteria that do have a cell wall can either grow as single cells or as f_____

A

filaments

22
Q

What are teh 3 types of bacteria that can grow as single cells?

A

Rods, Cocci and Spirochaetes

23
Q

What are the 2 main aerobic gram positive bacteria?

A

Staphylococcus and streptococcus

24
Q

What are the 3 types of streptococcae?

A

Beta-haemolytic, alpha-haemolytic and non-haemolytic

25
Q

What are anaerobic gram positive bacteria?

A

Peptostreptococcus

Microbiology (15 decks)

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