$$\mathrm{ADP} + \mathrm{P}_i + \text{energy} \rightarrow \mathrm{ATP}$$

Question 1

Which of the following best describes the difference between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism breaks down macromolecules to release energy, while anabolism builds macromolecules using energy.

Question 2

Which of the following equations correctly represents the phosphorylation of ADP to ATP?

Accepted Answer

$$\mathrm{ADP} + \mathrm{P}_i + 	ext{energy} ightarrow \mathrm{ATP}$$

Question 3

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

Accepted Answer

2 ATP and 2 NADH

Question 4

Which process generates the largest amount of ATP during aerobic cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 5

In the absence of oxygen, which process allows microorganisms to continue generating ATP?

Accepted Answer

Fermentation

Question 6

Which of the following is the correct sequence of events in aerobic respiration?

Accepted Answer

Glycolysis → Pyruvate oxidation → Krebs cycle → Electron transport chain

Question 7

What is the primary function of fermentation in microbial metabolism?

Accepted Answer

To recycle NADH back into NAD+

Question 8

Which of the following statements about redox reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 9

In lactic acid fermentation, what is the final electron acceptor?

Accepted Answer

Pyruvate

Question 10

Which of the following best explains why oxidative phosphorylation produces more ATP than substrate-level phosphorylation?

Accepted Answer

It uses the energy from the electron transport chain to create a proton gradient, which drives ATP synthesis.

Question 11

Which of the following is a product of alcohol fermentation?

Accepted Answer

Ethanol and CO$$_2$$

Question 12

What is the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an electron shuttle, accepting electrons during catabolic reactions.

Question 13

Which of the following statements about the electron transport chain (ETC) is correct?

Accepted Answer

Electrons move through the ETC, releasing energy used to pump protons across a membrane.

Question 14

Which of the following is true regarding substrate-level phosphorylation?

Accepted Answer

It involves the direct transfer of a phosphate group to ADP from a phosphorylated intermediate.

Question 15

A patient’s muscle cells are deprived of oxygen during intense exercise. Which metabolic pathway will their cells rely on to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 16

Which of the following best describes chemiosmosis?

Accepted Answer

The use of a proton gradient to drive ATP synthesis via ATP synthase

Question 17

Which of the following is a key difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses an inorganic molecule other than oxygen.

Question 18

Which of the following is a correct summary equation for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 19

Which of the following is a primary function of both lactic acid fermentation and alcohol fermentation?

Accepted Answer

Oxidation of NADH to NAD+

Question 20

A bacterium is growing in an environment lacking oxygen but still produces ATP. Which process is most likely responsible for its ATP production?

Accepted Answer

Fermentation

Microbial Metabolism: An Overview for Health Professionals

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