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

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 process occurs in both prokaryotic and eukaryotic cells and does NOT require oxygen?

Accepted Answer

Glycolysis

Question 3

Why is ATP considered a 'packet' of energy in cellular respiration?

Accepted Answer

It stores manageable amounts of energy for cellular work, preventing energy loss as heat.

Question 4

Which of the following is NOT powered by ATP?

Accepted Answer

Diffusion of oxygen across a membrane

Question 5

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

Accepted Answer

$$2$$

Question 6

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

Accepted Answer

Electron Transport Chain

Question 7

Why does the Citric Acid Cycle run twice for each glucose molecule?

Accepted Answer

Because glycolysis produces two pyruvate molecules from one glucose

Question 8

Which molecule acts as a reducing agent, carrying electrons to the Electron Transport Chain?

Accepted Answer

NADH

Question 9

What is the main difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down molecules and release energy; anabolic pathways build molecules and require energy.

Question 10

Which of the following is a real-world example of fermentation?

Accepted Answer

Yeast producing ethanol and CO$$_2$$ during wine making

Question 11

Which Nobel Prize-winning discovery was related to the enzyme ATP synthase?

Accepted Answer

Paul Boyer and John Walker's work on ATP synthase in 1997

Question 12

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; animals must consume plants or other animals.

Question 13

Which step of cellular respiration is considered the most ancient and occurs in all cells with cytoplasm?

Accepted Answer

Glycolysis

Question 14

If a mutation prevented the formation of NADH during the Citric Acid Cycle, what would be the most immediate effect on cellular respiration?

Accepted Answer

The Electron Transport Chain would produce much less ATP.

Question 15

Which of the following is a by-product of yeast fermentation used in baking?

Accepted Answer

CO$$_2$$

Question 16

Which process is responsible for the tangy flavor in citrus fruits and is also a key intermediate in the Citric Acid Cycle?

Accepted Answer

Citric acid (citrate) formation

Question 17

A patient has a mitochondrial disorder that impairs the Electron Transport Chain. Which symptom would most likely result?

Accepted Answer

Severe fatigue due to low ATP production

Question 18

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

Accepted Answer

Fermentation does not use the Electron Transport Chain, so less energy is extracted from glucose.

Question 19

Which of the following is true about the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis produces glucose, which is then used in cellular respiration to generate ATP.

Question 20

Which of the following best describes the role of oxygen in the Electron Transport Chain?

Accepted Answer

It acts as the final electron acceptor, forming water.

Cellular Respiration: Pathways, Mechanisms, and Applications

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