Question 1

Which of the following statements regarding the Entner-Doudoroff pathway is TRUE?

Accepted Answer

A) It involves glycolysis. 
B) It involves the pentose phosphate pathway. 
C) NADH is generated. 
D) ATP is generated. 
E) NADH and ATP are generated.

Question 2

Figure 5.1 
-Which compound is being reduced in the reaction shown in Figure 5.1?

Accepted Answer

A) isocitric acid and α-ketoglutaric acid 
B) α-ketoglutaric acid and NAD⁺ 
C) NAD⁺ 
D) NADH 
E) NADH and isocitric acid

Question 3

Glycolysis is utilized by cells in both respiration and fermentation.

Accepted Answer

A) True 
 B)False

Question 4

Assume you are growing bacteria on a lipid medium that started at pH 7.The action of bacterial lipases should cause the pH of the medium to

Accepted Answer

A) increase (become more alkaline). 
B) decrease (become more acidic). 
C) stay the same.

Question 5

An enzyme,citrate synthase,in the Krebs cycle is inhibited by ATP.This is an example of all of the following EXCEPT

Accepted Answer

A) allosteric inhibition. 
B) competitive inhibition. 
C) feedback inhibition. 
D) noncompetitive inhibition.

Question 6

Assume you are working for a chemical company and are responsible for growing a yeast culture that produces ethanol.The yeasts are growing well on the maltose medium but are not producing alcohol.What is the most likely explanation?

Accepted Answer

A) The maltose is toxic. 
B) O₂ is in the medium. 
C) Not enough protein is provided. 
D) The temperature is too low. 
E) The temperature is too high.

Question 7

From the list below,which is NOT produced during the Krebs cycle?

Accepted Answer

A) FADH₂ 
B) NADH 
C) ATP 
D) NADPH 
E) CO₂

Exam 5: Microbial Metabolism