Q: Which of the following equations correctly represents the net output of glycolysis?

$$\text{Glucose} + 2 \text{ATP} + 4 \text{ADP} + 4 P_i + 2 \text{NAD}^+ \rightarrow 2 \text{Pyruvic acid} + 2 \text{ADP} + 2 P_i + 4 \text{ATP} + 2 \text{NADH} + 2H^+$$

Question 1

Which molecule is the primary energy currency in microbial metabolism?

Accepted Answer

ATP

Question 2

During glycolysis, what is the net gain of ATP per molecule of glucose?

Accepted Answer

$$2$$

Question 3

Which process yields the highest amount of ATP per glucose molecule in bacteria?

Accepted Answer

Cellular aerobic respiration

Question 4

In lactic acid fermentation, which enzyme catalyzes the conversion of pyruvic acid to lactic acid?

Accepted Answer

Lactate dehydrogenase

Question 5

Which of the following is a correct input-output relationship for alcohol fermentation?

Accepted Answer

Input: 2 pyruvic acid + 2 NADH + 2H$$^+$$; Output: ethanol + CO$$_2 + 2 $$NAD$$^+$$

Question 6

Which statement best describes competitive inhibition?

Accepted Answer

The inhibitor competes with the substrate for the active site.

Question 7

What is the main reason cells use fermentation instead of respiration?

Accepted Answer

Fermentation occurs when oxygen or other conditions required for respiration are absent.

Question 8

Which of the following is NOT a typical end product of bacterial fermentation?

Accepted Answer

Glucose

Question 9

During cellular aerobic respiration, what is the terminal electron acceptor?

Accepted Answer

Oxygen

Question 10

Which step in aerobic respiration produces the most ATP?

Accepted Answer

Electron Transport Chain

Question 11

If a bacterium uses nitrate as its terminal electron acceptor, which type of respiration is it performing?

Accepted Answer

Anaerobic respiration

Question 12

Which of the following equations correctly represents the net output of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2 	ext{ATP} + 4 	ext{ADP} + 4 P_i + 2 	ext{NAD}^+ ightarrow 2 	ext{Pyruvic acid} + 2 	ext{ADP} + 2 P_i + 4 	ext{ATP} + 2 	ext{NADH} + 2H^+$$

Question 13

Which of the following is a distinguishing feature of noncompetitive inhibition?

Accepted Answer

The inhibitor binds to a site other than the active site, altering enzyme function.

Question 14

Which fermentation process is used by yeast to produce alcoholic beverages?

Accepted Answer

Alcohol fermentation

Question 15

Which of the following bacteria is known for producing mixed acid fermentation products?

Accepted Answer

Escherichia coli

Question 16

A patient’s muscle cells are deprived of oxygen during intense exercise. Which metabolic pathway will be primarily used to generate ATP?

Accepted Answer

Lactic acid fermentation

Question 17

Which of the following statements about anaerobic respiration is TRUE?

Accepted Answer

It produces more ATP than fermentation but less than aerobic respiration.

Question 18

Which of the following is a correct summary of the ATP yield from one glucose molecule in aerobic respiration in bacteria?

Accepted Answer

$$\sim 38$$ ATP

Question 19

Which of the following is a real-world application of fermentation in food production?

Accepted Answer

Production of cheese by lactic acid bacteria

Microbial Metabolism: Energy Production and Enzyme Regulation

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