MICROBIOLOGY EXAM 2 STUDY TEST PAPER
2026 FULL QUESTIONS AND ANSWERS
ALREADY PASSED
◉ Which organism can cause "traveler's diarrhea" in developing
countries? Answer: E. coli
◉ Which organism is typically MUG positive and what does a
positive reaction look like? Answer: E. coli (not E. coli 0157);
fluorescence
◉ Which organisms produce lactose positive colonies on MAC and
what is the expected appearance of the organisms? Answer: E. coli,
Klebsiella & Enterobacter are lactose + & produce red/pink colonies
◉ Which organism causes most urinary tract infections? Answer: E.
coli
,◉ Voges-Proskauer = Pink; Phenylalanine = No color change
KIA = A/A; Citrate = Blue
Lysine = Purple (Control tube - yellow)
Indole = No color change; ONPG = Yellow
Urea = Pink; Motility = Positive
DNAse = No clearing
What is the identification? Answer: Enterobacter species
◉ Voges-Proskauer = No color change
Phenylalanine = No color change
Kligler iron agar = Yellow/yellow; Citrate = Green
Lysine = Purple (Control tube - yellow); Indole = Red
ONPG = Yellow; Urea = Yellow; Motility = Positive
What is the identification? Answer: Escherichia coli
◉ Which of the Haemphilus species are NOT normal flora? Answer:
H. ducreyi & H. aegyptius
◉ Which two Haemophilus species require X and V factors for
growth? Answer: H. haemolyticus (hemolytic) & H. influenzae
(nonhemolytic)
, ◉ Which two Haemophilus species require V factor for growth?
Answer: H. parahinfluenzae (nonhemolytic) & H. parahaemolyticus
(hemolytic)
◉ Which two Haemophilus species are porphyrin test positive
(fluorescence)? Answer: H. parainfluenzae (no hemolysis present) &
H. parahaemolyticus (hemolysis)
◉ Which organism causes pinkeye? Answer: Haemophilus aegyptius
◉ Which organism is transmitted sexually and causes a chancroid or
soft chancre? Answer: Haemophilus ducreyi
◉ Which gram negative bacilli satellite around staphylococci on
sheep blood agar? What nutrient is supplied by the staphylococci?
Answer: Haemophilus; V factor (NAD)
◉ Which two enteric organisms are nonmotile? Answer: Klebsiella &
Shigella
◉ Voges-Proskauer = Pink; Phenylalanine = No color change
TSI = A/A; Citrate = Blue
Lysine = Purple (Control tube - yellow)
Indole = No color change; ONPG = Yellow
2026 FULL QUESTIONS AND ANSWERS
ALREADY PASSED
◉ Which organism can cause "traveler's diarrhea" in developing
countries? Answer: E. coli
◉ Which organism is typically MUG positive and what does a
positive reaction look like? Answer: E. coli (not E. coli 0157);
fluorescence
◉ Which organisms produce lactose positive colonies on MAC and
what is the expected appearance of the organisms? Answer: E. coli,
Klebsiella & Enterobacter are lactose + & produce red/pink colonies
◉ Which organism causes most urinary tract infections? Answer: E.
coli
,◉ Voges-Proskauer = Pink; Phenylalanine = No color change
KIA = A/A; Citrate = Blue
Lysine = Purple (Control tube - yellow)
Indole = No color change; ONPG = Yellow
Urea = Pink; Motility = Positive
DNAse = No clearing
What is the identification? Answer: Enterobacter species
◉ Voges-Proskauer = No color change
Phenylalanine = No color change
Kligler iron agar = Yellow/yellow; Citrate = Green
Lysine = Purple (Control tube - yellow); Indole = Red
ONPG = Yellow; Urea = Yellow; Motility = Positive
What is the identification? Answer: Escherichia coli
◉ Which of the Haemphilus species are NOT normal flora? Answer:
H. ducreyi & H. aegyptius
◉ Which two Haemophilus species require X and V factors for
growth? Answer: H. haemolyticus (hemolytic) & H. influenzae
(nonhemolytic)
, ◉ Which two Haemophilus species require V factor for growth?
Answer: H. parahinfluenzae (nonhemolytic) & H. parahaemolyticus
(hemolytic)
◉ Which two Haemophilus species are porphyrin test positive
(fluorescence)? Answer: H. parainfluenzae (no hemolysis present) &
H. parahaemolyticus (hemolysis)
◉ Which organism causes pinkeye? Answer: Haemophilus aegyptius
◉ Which organism is transmitted sexually and causes a chancroid or
soft chancre? Answer: Haemophilus ducreyi
◉ Which gram negative bacilli satellite around staphylococci on
sheep blood agar? What nutrient is supplied by the staphylococci?
Answer: Haemophilus; V factor (NAD)
◉ Which two enteric organisms are nonmotile? Answer: Klebsiella &
Shigella
◉ Voges-Proskauer = Pink; Phenylalanine = No color change
TSI = A/A; Citrate = Blue
Lysine = Purple (Control tube - yellow)
Indole = No color change; ONPG = Yellow
