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BACTE LEC FINALS > F10 > Flashcards

F10 Flashcards

1
Q

Which of the following choices regarding enterics is false?
Providencia is catalase positive
Morganella shows a (+-+-) IMVC reaction
C. koseri is ONPG negative
Providencia shows a R/A reaction on Lysine iron agar
Citrobacter colonies appear gray with a shiny surface

A

-Morganella shows a (+-+-) IMVC reaction

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2
Q

Which of the following choices regarding different biochemical tests is true?
None of the choices
Citrobacter freundii is indole positive
Proteus vulgaris is indole negative
Indole test uses tryptophan and added on agar media
Indole test uses PDAB and added on broth media

A

-Indole test uses PDAB and added on broth media

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3
Q

Which of the following choices regarding enterics is true?
Typhidot IgG assay is designed to test for new infections
Salmonella cholerasuis produces red colonies on XLD media
Edwardsiella species are lactose fermenters
Shigella is Methyl red variable
Salmonella typhi are is aerogenic

A

-Salmonella cholerasuis produces red colonies on XLD media

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4
Q

Which of the following is the result of Arginine dihydrolase test of E. cloacae?
Negative
None of the choices
Weakly positive
Positive
Variable

A

-Positive

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5
Q

Which of the following is a non – motile enteric?
Shigella
Proteus
Citrobacter
Salmonella
None of the choices

A

-Shigella

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6
Q

Which of the following choices regarding biochemical tests is false?
MIU test can determine urease activity of bacterium
Enterococcus faecium is non - motile
Urease hydrolyzes urea to form ammonia, water and CO2 0.4% agar concentrations are added on semi solid medias for motility test
Motile bacteria shows a diffuse, turbid growth that renders no opacity

A

-Motile bacteria shows a diffuse, turbid growth that renders no opacity

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7
Q

Decipher the statements and choose the correct answer among the choices.
I. E. coli shows positive motility test
II. Zinc dust is added to determine a true negative result in nitrate reduction
III. MUG test is specifically made for Pseudomonas species
IV. ONPG turns yellow on lactose fermenting bacteria
V. Ureaplasma is urease positive
VI. Vibrio is urease negative
Statements II, V & VI are True
Statements II, III & IV are False
Statements II, IV & V are False
Statements III, IV & VI are True
Statements I, II & III are True

A

-Statements II, V & VI are True

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8
Q

Which of the following choices regarding enterics is true?
Presence of black spots is indicative of Schwartzmann phenomenon in Yersinia pestis infection
Yersinia shows a stalagmite streamer on old cultures
Enteropathogenic E. coli produces watery diarrhea with mucus and blood
Y. pestis Var Antigua is glycerol fermentation positive

A

-Presence of black spots is indicative of Schwartzmann phenomenon in Yersinia pestis infection

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9
Q

Which of the following is the appearance of E. coli in Hektoen enteric agar?
Green colonies
Blue colonies
Metallic sheen
Yellow colonies
Red colonies

A

-Yellow colonies

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10
Q

Decipher the statements and choose the correct answer among the choices.
I. Cryptococcus species are urease positive
II. Brucella is urease positive
Statements is True and II is False
Statement I & II are False
Statements I & II are True
Statements & II are False
None of the choices

A

-Statements I & II are True

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11
Q

Which of the following is the common antigen found in the capsule of salmonella?
Flagellar antigen’
Somatic antigen
Vi antigen
O antigen
None of the choices

A

-Vi antigen

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12
Q

Which of the following choices regarding biochemical tests is false?
Pseudomnas shows K/K result on TSI agar
K/K result indicates glucose, lactase and sucrose are not fermented
Shigella shows K/A result on TSI agar
Citrobacter freundii is a citrate utilization test negative bacterium
TSIA contains peptone which acts as a source of nitrogen

A

-Citrobacter freundii is a citrate utilization test negative bacterium

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13
Q

Which of the following describes the TSIA result of Enterobacter?
A/A GAS AND H2S negative
K/A GAS AND H2S NEGATIVE
K/K GAS POSITIVE AND H2S NEGATIVE
K/K GAS NEGATIVE AND H2S POSITIVE
None of the choices

A

-A/A GAS AND H2S negative

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14
Q

Which pathogenic group of E. coli is age dependently involved in diarrhea of children?
EHEC
ETEC
EPEC
DAEC
None of the choices

A

-DAEC

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15
Q

Which of the following describes the flagellar arrangement of enterics?
Monotrichous
Peritrichous
Atrichous
Amphitrichous
None of the choices

A

-Peritrichous

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16
Q

Which of the following choices regarding biochemical tests is true?
Methy red negative organisms include Proteus species
Christens media produces a pink color at alkaline pH
VP positive organisms include Citrobacter
Citrate positive organisms will show an intense green blue color in the slant
Simmon citrate media is a agar plate media

A

-Christens media produces a pink color at alkaline pH

17
Q

Which of the following choices regarding enterics is false?
Klebsiella shows a variable positive for Methy red
Serratia secrets prodigiosin which causes red pigmented colonies
Dienes line was first described in 1946
Both P. mirabilis and P. vulgaris are known to produce swarming motility
P. mirabilis is ornithine decarboxylase positive

A

-Klebsiella shows a variable positive for Methyl red

18
Q

Decipher the statements and choose the correct answer among the choices.
I. Citrobacter shows an IMVC result of -+-+
II. EAEC produces autoagglutination appearing as stacked brick arrangement
III. EIEC shows a shigella like infection
IV. Providencia are associated with patient’s undergoing dialysis
V. Salmonellosis is often caused by infected poulty and eggs
Statements II, IV & V are False
Statements I, II & III are False
Statements IV & V are False
Statements I, III & V are True
Statements I, III & IV are False

A

-Statements I, III & V are True

19
Q

Decipher the statements and choose the correct answer among the choices.
I. Hafnia appear as straight rods with peritrichous flagella
II. Hafnia can resemble salmonella
III. XLD agar is recommended for culture of Hafnia
IV. Morganella can ferment mannose
V. K oxytoca is indole positive
statements I, II & III are False
Statements I, II & IV are True
Statements III, IV & V are True
Statements I, III & V are False
Statements II, III & V are False

A

Statements I, II & IV are True

20
Q

Which of the following is not a characteristic of Enterobacteriaceae?
Non sporulating
Facultative anaerobes and ferment glucose
Able to reduce nitrate to nitrite
Gram negative, long rods with straight sides and polar cap
None of the above

A

-Gram negative, long rods with straight sides and polar caps

BACTE LEC FINALS (7 decks)

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