Q: Which of the following equations correctly represents the overall reaction for aerobic respiration of glucose?

$$\mathrm{C_6H_{12}O_6$} + 6\,\mathrm{O_2$} \rightarrow 6\,\mathrm{CO_2$} + 6\,\mathrm{H_2O} + \text{energy}$$

Question 1

Which of the following best describes a chemolithoautotroph?

Accepted Answer

Uses chemical compounds as an energy source, inorganic molecules as electron donors, and carbon dioxide as a carbon source.

Question 2

In the ATP cycle, which process is responsible for the phosphorylation of ADP to ATP using energy from the proton motive force?

Accepted Answer

Oxidative phosphorylation

Question 3

A bacterium that uses organic molecules as both its energy and electron source, and organic carbon as its carbon source, is classified as a:

Accepted Answer

Chemoorganoheterotroph

Question 4

Which of the following statements about catabolism and anabolism is correct?

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism uses energy to build macromolecules.

Question 5

Which of the following equations correctly represents the overall reaction for aerobic respiration of glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\,\mathrm{O_2$} ightarrow 6\,\mathrm{CO_2$} + 6\,\mathrm{H_2O} + 	ext{energy}$$

Question 6

Which process generates the greatest theoretical maximum yield of ATP per glucose molecule in prokaryotes?

Accepted Answer

Aerobic respiration

Question 7

In the electron transport chain, electrons flow from carriers with more negative $$E_0$$'$$ to carriers with more positive E_0$'. $$What is the significance of this flow?

Accepted Answer

It generates a proton motive force used to drive ATP synthesis.

Question 8

Which of the following is a key difference between respiration and fermentation in prokaryotes?

Accepted Answer

Respiration involves an electron transport chain and generates a proton motive force, while fermentation does not.

Question 9

Which of the following best explains why 1 gallon of gasoline produces approximately 20 pounds of CO$$_2$$ when burned, even though it weighs only about 6.3 pounds?

Accepted Answer

Oxygen from the air combines with carbon in gasoline, increasing the total mass of CO$$_2$$ produced.

Question 10

Which pathway is primarily responsible for the complete oxidation of acetyl-CoA to CO$$_2 in $$aerobic respiration?

Accepted Answer

Tricarboxylic acid (TCA) cycle

Question 11

A bacterium is growing in an environment with no oxygen but with nitrate available as a terminal electron acceptor. Which process is it most likely using?

Accepted Answer

Anaerobic respiration

Question 12

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group from a phosphorylated substrate to ADP to form ATP.

Question 13

Which of the following is a product of the Embden-Meyerhof pathway (glycolysis) per molecule of glucose?

Accepted Answer

$$2$$ pyruvate, $$2$$ ATP, $$2$$ NADH$

Question 14

Which of the following best describes the role of ATP synthase in cellular metabolism?

Accepted Answer

It uses the energy of the proton motive force to synthesize ATP from ADP and Pi.

Question 15

Which of the following is a real-world application of chemolithotrophy?

Accepted Answer

Oxidation of ammonia to nitrate in soil by nitrifying bacteria.

Question 16

Which of the following is true regarding the electron transport chain in mitochondria?

Accepted Answer

The flow of electrons is coupled to the pumping of protons across the membrane, generating a proton gradient.

Question 17

Which of the following best explains why fermentation yields less ATP than aerobic respiration?

Accepted Answer

Fermentation does not use an electron transport chain and only produces ATP by substrate-level phosphorylation.

Question 18

Which Nobel Prize-winning scientist is credited with the discovery of the chemiosmotic theory explaining ATP synthesis?

Accepted Answer

Peter D. Mitchell

Microbial Metabolism: Energy, Electron, and Carbon Sources

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