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

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

Question 1

Which of the following best describes the main function of cellular respiration in eukaryotic cells?

Accepted Answer

To generate ATP for cellular work by harvesting energy from organic molecules

Question 2

During strenuous exercise, when your muscles outstrip your body's ability to deliver oxygen, which process provides ATP to your muscle cells?

Accepted Answer

Anaerobic fermentation, producing lactic acid as a by-product

Question 3

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 4

Which stage of cellular respiration produces the most ATP molecules per glucose molecule consumed?

Accepted Answer

Electron transport chain

Question 5

In the absence of oxygen, human muscle cells regenerate NAD+ by:

Accepted Answer

Adding electrons to pyruvic acid, forming lactic acid

Question 6

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis splits one glucose molecule into two molecules of pyruvic acid

Question 7

What is the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during glycolysis and the citric acid cycle

Question 8

Which of the following best explains why plants are considered autotrophs?

Accepted Answer

They make their own organic molecules from inorganic sources using energy from sunlight

Question 9

During the citric acid cycle, what happens to the carbon atoms from the original glucose molecule?

Accepted Answer

They are released as $CO_2$

Question 10

Which of the following is a correct sequence of the stages of cellular respiration?

Accepted Answer

Glycolysis $\rightarrow$ Citric acid cycle $\rightarrow$ Electron transport chain

Question 11

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is primarily responsible for the continued production of ATP in their muscle cells under these conditions?

Accepted Answer

Anaerobic fermentation producing lactic acid

Question 12

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

Accepted Answer

It uses electrons from NADH to pump protons and generate ATP via ATP synthase

Question 13

If a poison blocks the function of ATP synthase, which of the following would be the most immediate effect on cellular respiration?

Accepted Answer

ATP production by oxidative phosphorylation would decrease dramatically

Question 14

Which of the following is NOT a product of cellular respiration?

Accepted Answer

Oxygen

Question 15

Why is oxygen required for aerobic cellular respiration?

Accepted Answer

It acts as the final electron acceptor in the electron transport chain

Question 16

Which of the following best explains the relationship between photosynthesis and cellular respiration in the biosphere?

Accepted Answer

Photosynthesis converts solar energy into chemical energy, which is then used by cellular respiration to generate ATP

Question 17

A scientist measures the ATP yield from one molecule of glucose in a eukaryotic cell. Which of the following is the closest to the maximum number of ATP molecules produced?

Accepted Answer

32

Question 18

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+

Question 19

In which part of the cell does glycolysis occur?

Accepted Answer

Cytoplasm

Question 20

Which of the following best describes the fate of electrons carried by NADH during aerobic respiration?

Accepted Answer

They are transferred to the electron transport chain and ultimately to oxygen, forming water

Cellular Respiration, Fermentation, and Energy Flow in Biology

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