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

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

Question 1

Which of the following statements best describes the main difference between aerobic and anaerobic respiration in bacteria?

Accepted Answer

Aerobic respiration uses oxygen as the terminal electron acceptor, while anaerobic respiration uses other inorganic compounds such as $$\mathrm{NO_3$^-} or$$ $$\mathrm{SO_4$^{2-}}.$$

Question 2

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

Which of the following is a correct summary of the products generated from one glucose molecule after the citric acid cycle (TCA cycle) is completed?

Accepted Answer

$$6 CO$_2$$, $$8$$ NADH, $$2$$ FADH$$_2$$, $$2$$ GTP

Question 4

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Oxidative phosphorylation via the electron transport chain and ATP synthase

Question 5

What is the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during glycolysis and the TCA cycle and donating them to the electron transport chain.

Question 6

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

Accepted Answer

Fermentation does not use the electron transport chain or generate a proton motive force.

Question 7

Which of the following is a common product of lactic acid fermentation?

Accepted Answer

Lactic acid

Question 8

In the electron transport chain, what is the main function of cytochromes?

Accepted Answer

To act as electron carriers, transferring electrons via redox reactions involving the iron atom in heme groups

Question 9

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

Accepted Answer

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

Question 10

Which of the following is NOT a possible terminal electron acceptor in anaerobic respiration?

Accepted Answer

$$\mathrm{O_2$}$$

Question 11

A bacterium is growing in an environment lacking oxygen but containing nitrate ($$\mathrm{NO_3$^-}). $$Which process is it most likely using to generate ATP?

Accepted Answer

Anaerobic respiration

Question 12

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP synthesis directly coupled to the transfer of a phosphate group from a high-energy substrate to ADP

Question 13

Which of the following is a key feature of the ATP synthase (ATPase) enzyme complex?

Accepted Answer

It is embedded in the cytoplasmic membrane and synthesizes ATP using the energy from the proton motive force.

Question 14

Which of the following statements about the proton motive force (PMF) is correct?

Accepted Answer

PMF is generated by the movement of electrons through the electron transport chain, which pumps protons across the membrane.

Question 15

Which of the following best explains why bacteria and archaea are considered metabolically diverse?

Accepted Answer

They can use a variety of organic and inorganic compounds as electron donors and acceptors.

Question 16

Which of the following is a correct pairing of fermentation type and its main product?

Accepted Answer

Propionic acid fermentation – propionate

Question 17

Which of the following best describes the fate of pyruvate under fermentative conditions?

Accepted Answer

It is reduced to various organic compounds, serving as an electron acceptor.

Question 18

Which of the following is a true statement about the role of quinones in the electron transport chain?

Accepted Answer

Quinones are non-protein electron carriers that shuttle electrons between protein complexes.

Question 19

A mutation in a bacterium prevents the function of ATP synthase. Which of the following would be the most direct consequence?

Accepted Answer

The cell would be unable to synthesize ATP via oxidative phosphorylation.

Microbial Energetics: Metabolic Pathways and Energy Conservation

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