Q: Which of the following equations correctly represents the overall oxidation of glucose during cellular 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 best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP fuels cellular work by providing energy for metabolic reactions.

Question 2

During glycolysis, how many net ATP molecules are produced per molecule of glucose?

Accepted Answer

$$2$$

Question 3

Which enzyme in glycolysis is regulated by feedback inhibition from ATP, and what is the effect of high ATP levels?

Accepted Answer

Phosphofructokinase; high ATP levels inhibit its activity

Question 4

What is the primary function of the electron transport chain (ETC) in cellular respiration?

Accepted Answer

To pump protons across the mitochondrial inner membrane, creating a proton gradient

Question 5

Which of the following equations correctly represents the overall oxidation of glucose during cellular 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 6

In which cellular compartment does pyruvate processing occur in eukaryotic cells?

Accepted Answer

Mitochondrial matrix

Question 7

What is the fate of NADH produced during glycolysis under anaerobic conditions in muscle cells?

Accepted Answer

It is used to reduce pyruvate to lactate, regenerating NAD$$^+.$$

Question 8

Which statement best explains why fermentation is less efficient than aerobic respiration?

Accepted Answer

Fermentation does not fully oxidize glucose, resulting in less ATP production.

Question 9

During the citric acid cycle, what is the total yield of NADH, FADH$$_2$$, and ATP per glucose molecule?

Accepted Answer

$$6$$ NADH, $$2$$ FADH$$_2$$, $$2$$ ATP

Question 10

Which process in cellular respiration directly produces the most ATP?

Accepted Answer

Oxidative phosphorylation (chemiosmosis)

Question 11

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which step of cellular respiration would be most directly affected?

Accepted Answer

Electron transport and chemiosmosis

Question 12

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

O$$_2$$

Question 13

If a cell is exposed to a toxin that blocks the regeneration of NAD$$^+$$, which metabolic pathway would be immediately halted?

Accepted Answer

Glycolysis

Question 14

Which of the following is a waste product of pyruvate processing?

Accepted Answer

CO$$_2$$

Question 15

What is the main regulatory mechanism for both glycolysis and the citric acid cycle?

Accepted Answer

Feedback inhibition by ATP and NADH

Question 16

Which of the following statements about catabolic and anabolic pathways is correct?

Accepted Answer

Catabolic pathways break down molecules to produce ATP, while anabolic pathways use ATP to build macromolecules.

Question 17

Facultative anaerobes are organisms that:

Accepted Answer

Switch between fermentation and aerobic respiration depending on oxygen availability.

Question 18

Which of the following best explains why cells store glucose as glycogen or starch?

Accepted Answer

To prevent glucose from being oxidized too quickly and to maintain energy homeostasis.

Question 19

During alcohol fermentation in yeast, what are the final products?

Accepted Answer

Ethanol, CO$$_2$$, and NAD$$^+$$

Question 20

A muscle cell is deprived of oxygen during intense exercise. Which pathway allows it to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Cellular Respiration and Fermentation: An Overview of Energy Harvesting in Cells

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