Q: Which of the following equations correctly represents the overall process of cellular respiration?

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (ATP)}$$

Question 1

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

Accepted Answer

To break down organic molecules and generate ATP for cellular work

Question 2

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

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy (ATP)}$$

Question 4

Which process occurs in the cytoplasm and results in the partial oxidation of glucose to produce pyruvate?

Accepted Answer

Glycolysis

Question 5

Why is glycolysis considered an ancient metabolic pathway?

Accepted Answer

It occurs in the cytoplasm and does not require oxygen

Question 6

In the context of redox reactions, what does it mean when a molecule is oxidized?

Accepted Answer

It loses electrons

Question 7

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+

Question 8

A muscle cell is working hard during intense exercise and oxygen is scarce. Which process will the cell use to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 9

Which of the following best explains why the citric acid cycle turns twice for each molecule of glucose metabolized?

Accepted Answer

Each glucose molecule produces two molecules of pyruvate, each entering the cycle separately

Question 10

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced by transferring a phosphate group from a substrate to ADP

Question 11

During oxidative phosphorylation, what is the main role of the electron transport chain?

Accepted Answer

To transfer electrons from NADH and FADH2 to oxygen, creating a proton gradient

Question 12

What is the function of ATP synthase in cellular respiration?

Accepted Answer

It uses the energy of the proton gradient to synthesize ATP from ADP and $$P_i$$

Question 13

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during glycolysis and the citric acid cycle

Question 14

A poison that blocks the passage of electrons along the electron transport chain would result in which of the following?

Accepted Answer

A decrease in the proton gradient across the inner mitochondrial membrane

Question 15

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

Accepted Answer

Aerobic respiration uses an electron transport chain with oxygen as the final electron acceptor, while fermentation does not use an electron transport chain

Question 16

If a cell is deprived of oxygen, which of the following will immediately stop?

Accepted Answer

Electron transport chain

Question 17

Which of the following best explains why only a portion of the energy in glucose is transferred to ATP during cellular respiration?

Accepted Answer

Some energy is lost as heat during the process

Question 18

Which of the following statements about lactic acid fermentation is correct?

Accepted Answer

It regenerates NAD+ by reducing pyruvate to lactate

Question 19

A facultative anaerobe is an organism that:

Accepted Answer

Can survive using either fermentation or cellular respiration

Question 20

Which of the following best describes chemiosmosis in the context of cellular respiration?

Accepted Answer

The use of a proton gradient to drive the synthesis of ATP

Cellular Respiration & Fermentation: Energy Transformation in Cells

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