Q: Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

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

Question 1

Which of the following best describes the overall purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and other organic molecules to generate ATP for cellular work

Question 2

In the redox reaction $$\mathrm{Xe^- + Y \rightarrow X + Ye^-}$$, which molecule is oxidized and which is reduced?

Accepted Answer

Xe^- is oxidized; Y is reduced

Question 3

During glycolysis, which of the following is the net gain of ATP and NADH per molecule of glucose?

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 4

Which molecule acts as the final electron acceptor in aerobic cellular respiration?

Accepted Answer

O$$_2$$

Question 5

What is the main function of NAD+ in cellular respiration?

Accepted Answer

To serve as an electron carrier, accepting electrons during redox reactions

Question 6

Which of the following best explains why glycolysis must be coupled to either fermentation or cellular respiration?

Accepted Answer

To regenerate NAD+ so glycolysis can continue

Question 7

In the absence of oxygen, human muscle cells will convert pyruvate into which of the following products?

Accepted Answer

Lactate

Question 8

Which enzyme is a key regulatory point in glycolysis and is subject to feedback inhibition by ATP?

Accepted Answer

Phosphofructokinase

Question 9

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 10

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

Accepted Answer

It generates NADH and FADH$$_2$$ that feed electrons into the electron transport chain

Question 11

What is the main role of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons from NADH and FADH$$_2 to O$_2$$, creating a proton gradient

Question 12

Which process produces ATP by substrate-level phosphorylation?

Accepted Answer

Glycolysis and the citric acid cycle

Question 13

A poison that blocks the function of ATP synthase would directly prevent which of the following?

Accepted Answer

The synthesis of ATP from ADP and Pi during oxidative phosphorylation

Question 14

Which of the following is a key difference between fermentation and aerobic respiration?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor, while aerobic respiration uses O$$_2$$

Question 15

Which of the following best explains why the electron transport chain is organized into multiple steps rather than a single step?

Accepted Answer

To gradually release energy in small, manageable amounts for ATP synthesis

Question 16

Which of the following statements about the evolutionary significance of glycolysis is correct?

Accepted Answer

Glycolysis is found in nearly all organisms, suggesting it is an ancient metabolic pathway

Question 17

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would you expect to observe in their cells?

Accepted Answer

Accumulation of NADH and reduced regeneration of NAD+

Question 18

Which of the following best describes the fate of pyruvate in yeast cells under anaerobic conditions?

Accepted Answer

It is converted to ethanol and CO$$_2$$

Question 19

Which of the following is a product of the beta-oxidation pathway that feeds into the citric acid cycle?

Accepted Answer

Acetyl-CoA

Question 20

A cell is placed in an environment with no oxygen. Which of the following processes will continue to generate ATP?

Accepted Answer

Glycolysis coupled to fermentation

Cellular Respiration and Fermentation: Pathways of Energy Harvesting

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