$$\mathrm{C_6H_{12}O_6$} + \mathrm{O_2$} \rightarrow \mathrm{H_2O} + \mathrm{CO_2$} + 30\text{--}32\ \mathrm{ATP}$$

Question 1

Which of the following best describes the overall chemical equation for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + \mathrm{O_2$} ightarrow \mathrm{H_2O} + \mathrm{CO_2$} + 30	ext{--}32\ \mathrm{ATP}$$

Question 2

Which step of cellular respiration produces the greatest amount of ATP?

Accepted Answer

Electron Transport Chain

Question 3

Why is glycolysis considered a universal and primitive process?

Accepted Answer

It occurs in the cytoplasm and does not require mitochondria or oxygen.

Question 4

Which of the following is NOT a function powered by ATP in cells?

Accepted Answer

Diffusion and osmosis

Question 5

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

Accepted Answer

$$2$$

Question 6

Which molecule is the initial substrate for the Citric Acid/Krebs Cycle after glycolysis?

Accepted Answer

Acetyl CoA

Question 7

What is the main role of NADH in cellular respiration?

Accepted Answer

To carry electrons to the electron transport chain

Question 8

Which of the following statements about the Citric Acid/Krebs Cycle is TRUE?

Accepted Answer

It runs twice for each glucose molecule because glycolysis produces two pyruvates.

Question 9

Which of the following is a correct comparison between anabolic and catabolic pathways?

Accepted Answer

Anabolic pathways build large molecules from small ones and require energy; catabolic pathways break down large molecules and release energy.

Question 10

Which of the following best explains why plants and animals differ in how they obtain glucose for cellular respiration?

Accepted Answer

Plants produce glucose via photosynthesis, while animals must consume plants or other animals to obtain glucose.

Question 11

Which Nobel Prize-winning discovery was crucial for understanding ATP production in the electron transport chain?

Accepted Answer

The role of ATP synthase in ATP production

Question 12

In the absence of oxygen, which process allows some organisms to continue producing ATP?

Accepted Answer

Fermentation

Question 13

Which of the following is a by-product of alcoholic fermentation by yeast?

Accepted Answer

Ethanol and carbon dioxide

Question 14

A baker uses yeast to make bread rise. Which product of yeast fermentation is directly responsible for the rising of bread dough?

Accepted Answer

Carbon dioxide

Question 15

Which of the following best explains why the total ATP yield from cellular respiration is approximate (30–32 ATP)?

Accepted Answer

Some ATP is used to maintain the cycle itself and the process is not 100% efficient.

Question 16

Which of the following is TRUE about the location of the three main steps of cellular respiration?

Accepted Answer

Glycolysis occurs in the cytoplasm, while the Krebs cycle and electron transport chain occur in the mitochondria.

Question 17

Which of the following is a real-world example of an organism using anaerobic respiration?

Accepted Answer

Yeast fermenting sugar in cake batter to produce CO2 and ethanol

Question 18

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis is anabolic and produces glucose, which is then used in the catabolic process of cellular respiration.

Question 19

If a mutation prevented the production of ATP synthase in mitochondria, which step of cellular respiration would be most directly affected?

Accepted Answer

Electron Transport Chain

Question 20

A scientist is studying a prokaryotic cell. Which step of cellular respiration would NOT occur in this cell?

Accepted Answer

Citric Acid/Krebs Cycle

Cellular Respiration: Pathways, Mechanisms, and Applications

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