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microbiology exam 3 > 2020 > Flashcards

2020 Flashcards

1
Q

what organism causes scaled skin syndrome

A

staphlococcus auereus

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2
Q

what bacterial virulence factor has an activity that results in creation of a fibrin coat around bacteria

A

coagulase

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3
Q

what is false about staphlyococcus auereus

A

is gram negative

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4
Q

what is a role that staphylokinase plays for staphylococcus auereus

A

cleaves C3b and IgG

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5
Q

what gram-positive coccus is one of the main causes of hospital acquired infections of the elderly

A

enterococcus faecalis

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6
Q

what is true about rheumatic fever

A

causes myocarditis in susceptible individuals

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7
Q

what is true about streptococcus pneumoniae

A

is an alpha-hemolytic, encapsulated bacterium

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8
Q

which of the following is NOT true regarding streptococcus pyogenes M protein

A

anti-M protein antibodies are not produced during an infection by streptococcus pyogenes

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9
Q

which of the following is true about neisseria gonorrhoeae

A

undergoes phase variation of Opa proteins

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10
Q

what factor is the most importat in allowing intravascular survival of neisseria meningitidis

A

bacterial capsule

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11
Q

which of the following is true about infections by neisseria meningitidis

A

preventable by vaccination against capsular polysaccharides for some meningiococcal strains

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12
Q

which of the following is the mostly likely characteristic of campyylobacter jejune

A

acquired as a zoonotic infection, often from undercooked chicken and causes a mild, self-limiting gastroenteritis

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13
Q

to what surface feature of enteric bacteria does the term H-antigen refer

A

flagella

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14
Q

what is not a property associated with salmonella enterica serovar typhi

A

produces a cholera-like toxin

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15
Q

bacteroides fragilis is the most frequently isolated bacterium from abscesses caused by intestinal bacteria. this is partly because

A

its ability to resist phagocytosis

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16
Q

which of the following is not a virulence factor for helicobacter pylori

A

shiga-like toxin

17
Q

shiga toxin

A

removes a specific adenine base from 28s rRNA, stopping translation

18
Q

which of the following is not a property of pseudomonas aeruginosa

A

obligate intracellular pathogen

(IS 43 C, alignate production)

19
Q

what is a property of the dissaccharide-tetrapeptide component of bacterial peptidoglycan that is the tracheal ctotoxin of bordetella pertussis

A

it is shed from bacterial cells instead of being aboserbed and recycled

20
Q

these gram positive pleiomorphic rods produce a pseduomembrane in the throat that can block in the airways

A

corynebacterium diphtheriae

21
Q

which organism produces alpha toxin (a lecithinase-phospholipase C) and theta toxin that partially account for the organism’s tissue-destructiveness that often requires amputation to save the patient’s life

A

clostridium perfringens

22
Q

this gram-negative coccobacillus is transmitted zoonotically via fleas and eventually infects lymphnodes where it can cause a purulent infection. in some individuals the bacteria can subsequently spread to the lungs and be transmitted by aerosol from human to human

A

yersinia pestis

23
Q

which of the following is true for mycobacterium tuberculosis

A

the bacterium exhibits a very slow growth rate (doubling time of 1 day)

24
Q

a positive result with an acid-fast staining test on a sputum smear is indicative of which type of bacteria

A

mycobacterium tuberculosis

25
Q

bacteria of which genus are gram positive filamentous rods that are opportunisitic pathogens causing bronchopulmonary infections and brain abscesses

26
Q

a zoonotic disease is associated with which of the following bacteria

A

borrelia burgdoferi

27
Q

which form of chlamydia replicates within a host cell

A

reticulate body

28
Q

what is true about mycoplasma pneumoniae

A

immune protection fades after recovery from infection

29
Q

bacteria of which genus cause rocky mountain spotted fever

A

rickettsia

30
Q

which of the following is best associated with the viridans streptococci

A

dental caries

31
Q

what role does catalase have for those pathogen bacteria that express it

A

removes hydrogen peroxide produced by phagocytes

32
Q

scarlet fever is caused by what organism

A

streptocuccus pyogenes

33
Q

what symptoms are asssociated wiht tertiary syphilis

34
Q

what is trie about antigenic variation involving the pilin protein of neisseria gonorrhoeae

A

invovles recombination between silent and expressed copies of the pilin gene

microbiology exam 3 (4 decks)

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