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

Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

$$2$$

Question 3

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

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 4

What is the primary function of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

To donate electrons to the electron transport chain

Question 5

Which process occurs in the cytoplasm and does not require oxygen?

Accepted Answer

Glycolysis

Question 6

In the transition reaction, pyruvate is converted into which molecule before entering the Krebs cycle?

Accepted Answer

Acetyl-CoA

Question 7

Which of the following is a direct product of the Krebs cycle (Citric Acid Cycle)?

Accepted Answer

NADH

Question 8

If oxygen is not available, what process will cells use to generate ATP from glucose?

Accepted Answer

Fermentation

Question 9

Which of the following best explains why producers store energy as starch and consumers as glycogen?

Accepted Answer

Starch is a plant polysaccharide, while glycogen is an animal polysaccharide adapted for rapid energy release.

Question 10

Which step in cellular respiration produces the most ATP?

Accepted Answer

Electron Transport Chain

Question 11

A patient is unable to efficiently use oxygen in their cells. Which part of cellular respiration would be most affected?

Accepted Answer

Electron Transport Chain

Question 12

What is the role of ATP synthase in the mitochondria?

Accepted Answer

It synthesizes ATP from ADP and inorganic phosphate using the proton gradient.

Question 13

Which of the following is the correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Transition Reaction $$\rightarrow$$ Citric Acid Cycle $$\rightarrow$$ Electron Transport Chain

Question 14

How many NADH molecules are produced from one glucose molecule during glycolysis?

Accepted Answer

$$2$$

Question 15

Which of the following statements about the citric acid cycle is TRUE?

Accepted Answer

It generates both NADH and FADH$$_2$$ for use in the electron transport chain.

Question 16

A muscle cell is working hard and oxygen supply is limited. Which product will accumulate due to anaerobic respiration?

Accepted Answer

Lactic acid

Question 17

Which of the following is a correct input-output summary for glycolysis?

Accepted Answer

Input: $$\mathrm{C_6H_{12}O_6$}$$, Output: $$2$$ pyruvate, $$2$$ NADH, $$2$$ ATP (net)

Question 18

Which of the following best explains why oxygen is essential for maximum ATP production in cells?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing for efficient ATP synthesis.

Question 19

If a cell's mitochondria are damaged, which process would be least affected?

Accepted Answer

Glycolysis

Question 20

Which of the following is a real-world consequence of impaired cellular respiration in animals?

Accepted Answer

Muscle fatigue due to lactic acid buildup during intense exercise

Cellular Respiration: Pathways and Processes

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