Unit 4--Lab Quizzes (10-11)

Question 1

What color did our positive urea plates turn?

Yellow
Black
Pink
Blue

Answer 1

Pink

Question 2

What chemical is detected in a positive Voges Proskauer test?

Indole
H2S
Lactic acid
Acetoin

Answer 2

Acetoin

Question 3

Which of these shows as complete clearing on blood agar?

Alpha hemolysis
Beta hemolysis
Gamma hemolysis
Delta hemolysis

Answer 3

Beta hemolysis

Question 4

What color did our positive spot indole tests turn?

Yellow
Black
Green
Red

Answer 4

Red

Question 5

Why would a triple sugar iron agar tube have a black butt?

Sucrose fermented
Lactose fermented
H2S produced
Glucose fermented

Answer 5

H2S produced

Question 6

Which enzyme produced the bubbles when we added hydrogen peroxide?

Oxidase
DNase
Catalase
Dehydrogenase

Answer 6

Catalase

Question 7

What color is a negative citrate agar test?

Red
Blue
Yellow
Green

Answer 7

Green

Question 8

What did the Voges Proskauer test check for?

Deamination
Acid production
Acetoin
Lactose use

Answer 8

Acetoin

Question 9

What makes Mannitol Salt agar a selective media?

Azide
Salt
Mannitol
Bile acids

Answer 9

Salt

Question 10

What did we add to our DNA plates in order to visualize the results?

HCl
H2O
H2O2
Methylene blue

Answer 10

HCl