MicroBiology Home   Microbiology, 4/e               Prescott, Harley, Klein
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Chapter 9
Supplemental Quiz Questions

The following products were measured and expressed in arbitrary units for three different bacteria to identify their metabolic pathways.

Product

Bacterium A

Bacterium B

Bacterium C
Fumarate

2.4

0.0

46.2
Acetate

56.5

1.2

0.6
Lactate

79.5

14.6

11.7
Succinate

10.7

2.4

112.5
Ethanol

29.8

94.9

17.9
2,3 Butanediol

0.3

1.7

1.6
Butyrate

0.1

0.2

0.4
CO2

88.0

102.2

115.7

1. Which specific pathway is predominantly used by Bacterium A?
a. glycolysis
b. Kreb’s cycle
c. ethanol fermentation
d. mixed acid fermentation
e. pentose shunt

2. Which specific pathway is predominantly used by Bacterium B?
a. glycolysis
b.Kreb’s cycle
c. ethanol fermentation
d.mixed acid fermentation
e. pentose shunt

3. Which specific pathway is predominantly used by Bacterium C?
a. glycolysis
b.Kreb’s cycle
c. ethanol fermentation
d.mixed acid fermentation
e. pentose shunt

4. What is the number of ATP molecules obtained by the complete oxidation of one glucose molecule by Bacterium C?
a. 3
b. 10
c. 27
d. 39
e. 60

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