Q: Which of the following equations correctly summarizes the overall process of aerobic cellular respiration?

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

Question 1

Which of the following statements best explains why cells cannot use food molecules directly as an energy source?

Accepted Answer

The energy in food molecules must be transferred to ATP, which is the main energy currency that cells can use directly.

Question 2

During aerobic cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which of the following best describes the process of substrate-level phosphorylation?

Accepted Answer

ATP is produced by transferring a phosphate group directly from an intermediate substrate to ADP.

Question 4

Which of the following equations correctly summarizes the overall process of aerobic cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}$$

Question 5

Which of the following is the most reduced form of carbon found in the process of cellular respiration?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 6

In the absence of oxygen, which process allows glycolysis to continue by regenerating NAD+?

Accepted Answer

Fermentation

Question 7

Which of the following best explains why fatty acids are more energy-dense than carbohydrates?

Accepted Answer

Fatty acids are more reduced, containing more hydrogen atoms and electrons that can be transferred during redox reactions.

Question 8

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 9

If a person loses 10 pounds of fat through diet and exercise, where does most of the mass go?

Accepted Answer

It is released as $$CO_2$$ and $$H_2O$$ through respiration.

Question 10

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis occurs in the cytosol and produces a net gain of 2 ATP per glucose molecule.

Question 11

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

NAD+ acts as an oxidizing agent, accepting electrons from organic molecules.

Question 12

A patient is unable to utilize oxygen efficiently in their mitochondria. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 13

Which of the following is a correct sequence of energy flow during cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ Electron Transport Chain $$\rightarrow$$ Proton-motive force $$\rightarrow$$ ATP

Question 14

Which of the following best explains why cellular respiration produces more ATP than fermentation?

Accepted Answer

Cellular respiration uses oxygen as the final electron acceptor, allowing for complete oxidation of glucose.

Question 15

A marathon runner is using both aerobic and anaerobic pathways for energy. If she switches to only anaerobic metabolism, how much more glucose would she need to burn to produce the same amount of ATP as aerobic metabolism?

Accepted Answer

About 16 times more

Question 16

Which of the following is NOT a product of the citric acid cycle per turn?

Accepted Answer

Pyruvate

Question 17

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The movement of protons down their concentration gradient through ATP synthase to generate ATP.

Question 18

Which of the following is the main reason why the exact number of ATP molecules produced from one glucose molecule during cellular respiration is not known?

Accepted Answer

Some products of respiration are used in other metabolic pathways.

Question 19

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ so glycolysis can continue in the absence of oxygen.

Question 20

Which of the following is a correct comparison between alcohol fermentation and lactic acid fermentation?

Accepted Answer

Both processes regenerate NAD+ and allow glycolysis to continue, but alcohol fermentation produces ethanol and $$CO_2$$, while lactic acid fermentation produces lactate.

Cellular Respiration and Fermentation: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards