Microbiology- Exam Questions with 100% Correct Answers Latest
Graded A+
Voges-Proskauer = No color change
Phenylalanine = No color change
TSI = A/A, H2S; Citrate = Blue
Lysine = Yellow (Control tube - yellow)
Indole = No color change; ONPG = Yellow
Urea = Yellow; Motility = Positive
Question:
What is the identification?
Answer:
Citrobacter species
Question:
Which organism can cause "traveler's diarrhea" in developing countries?
Answer:
E. coli
Question:
Which organism is typically MUG positive and what does a positive reaction look like?
Answer:
E. coli (not E. coli 0157); fluorescence
Question:
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
,Question:
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
Question:
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
Question:
What is the identification?
Answer:
Escherichia coli
Question:
Which of the Haemphilus species are NOT normal flora?
Answer:
, H. ducreyi & H. aegyptius
Question:
Which two Haemophilus species require X and V factors for growth?
Answer:
H. haemolyticus (hemolytic) & H. influenzae (nonhemolytic)
Question:
Which two Haemophilus species require V factor for growth?
Answer:
H. parahinfluenzae (nonhemolytic) & H. parahaemolyticus (hemolytic)
Question:
Which two Haemophilus species are porphyrin test positive (fluorescence)?
Answer:
H. parainfluenzae (no hemolysis present) & H. parahaemolyticus (hemolysis)
Question:
Which organism causes pinkeye?
Answer:
Haemophilus aegyptius
Question:
Which organism is transmitted sexually and causes a chancroid or soft chancre?
Answer:
Haemophilus ducreyi
Question:
Which gram negative bacilli satellite around staphylococci on sheep blood agar? What nutrient is
supplied by the staphylococci?
Answer:
Haemophilus; V factor (NAD)
Graded A+
Voges-Proskauer = No color change
Phenylalanine = No color change
TSI = A/A, H2S; Citrate = Blue
Lysine = Yellow (Control tube - yellow)
Indole = No color change; ONPG = Yellow
Urea = Yellow; Motility = Positive
Question:
What is the identification?
Answer:
Citrobacter species
Question:
Which organism can cause "traveler's diarrhea" in developing countries?
Answer:
E. coli
Question:
Which organism is typically MUG positive and what does a positive reaction look like?
Answer:
E. coli (not E. coli 0157); fluorescence
Question:
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
,Question:
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
Question:
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
Question:
What is the identification?
Answer:
Escherichia coli
Question:
Which of the Haemphilus species are NOT normal flora?
Answer:
, H. ducreyi & H. aegyptius
Question:
Which two Haemophilus species require X and V factors for growth?
Answer:
H. haemolyticus (hemolytic) & H. influenzae (nonhemolytic)
Question:
Which two Haemophilus species require V factor for growth?
Answer:
H. parahinfluenzae (nonhemolytic) & H. parahaemolyticus (hemolytic)
Question:
Which two Haemophilus species are porphyrin test positive (fluorescence)?
Answer:
H. parainfluenzae (no hemolysis present) & H. parahaemolyticus (hemolysis)
Question:
Which organism causes pinkeye?
Answer:
Haemophilus aegyptius
Question:
Which organism is transmitted sexually and causes a chancroid or soft chancre?
Answer:
Haemophilus ducreyi
Question:
Which gram negative bacilli satellite around staphylococci on sheep blood agar? What nutrient is
supplied by the staphylococci?
Answer:
Haemophilus; V factor (NAD)
