Q: What is the balanced chemical equation for aerobic cellular respiration?

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

Question 1

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

Accepted Answer

Photosynthesis captures sunlight energy to produce glucose and oxygen, which are then used by cellular respiration to generate ATP, carbon dioxide, and water.

Question 2

What is the balanced chemical equation for aerobic cellular respiration?

Accepted Answer

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

Question 3

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

Accepted Answer

Oxygen ($$O_2)$$

Question 4

Which stage of cellular respiration produces the greatest number of ATP molecules per glucose?

Accepted Answer

Oxidative phosphorylation

Question 5

If a cell is deprived of oxygen, which process will continue to produce ATP?

Accepted Answer

Glycolysis followed by fermentation

Question 6

Which of the following statements about NAD+ is correct?

Accepted Answer

NAD+ is reduced to NADH during glycolysis and the citric acid cycle.

Question 7

A patient is suffering from a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be observed?

Accepted Answer

Accumulation of NADH and FADH2 in the mitochondria.

Question 8

Which process directly produces ATP by substrate-level phosphorylation?

Accepted Answer

Glycolysis and the citric acid cycle

Question 9

During lactic acid fermentation, what happens to NADH?

Accepted Answer

It is oxidized back to NAD+ as pyruvate is reduced to lactate.

Question 10

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

Accepted Answer

Glycolysis → Pyruvate oxidation → Citric acid cycle → Oxidative phosphorylation

Question 11

A cell metabolizes one molecule of glucose via aerobic respiration. What is the theoretical maximum number of ATP molecules produced?

Accepted Answer

32

Question 12

Which of the following is TRUE regarding the citric acid cycle?

Accepted Answer

It completes the oxidation of organic molecules and generates NADH and FADH2.

Question 13

Which molecule is formed when pyruvate is chemically groomed before entering the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 14

Fatty acids yield more ATP per gram than carbohydrates because:

Accepted Answer

They have more energy-rich electrons for oxidation.

Question 15

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

Accepted Answer

Conversion of pyruvate to lactate in muscle cells during intense exercise.

Question 16

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

Accepted Answer

Glucose

Question 17

In chemiosmosis, what drives the synthesis of ATP?

Accepted Answer

The diffusion of H+ ions through ATP synthase due to a concentration gradient.

Question 18

Which of the following best explains why some energy is lost as heat during cellular respiration?

Accepted Answer

Some energy is released in small amounts and dissipated as heat during the transfer of electrons.

Question 19

Which of the following is a correct description of a redox reaction in cellular respiration?

Accepted Answer

Glucose loses electrons (is oxidized) and oxygen gains electrons (is reduced).

Question 20

A person is fasting and their body begins to use proteins for energy. What must happen to amino acids before they can enter cellular respiration?

Accepted Answer

Their amino groups are removed and the remaining carbon skeletons enter glycolysis or the citric acid cycle.

How Cells Harvest Chemical Energy: Cellular Respiration and Fermentation

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