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

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

Question 1

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

Accepted Answer

Photosynthesis converts sunlight energy into chemical energy, producing organic molecules and oxygen, while cellular respiration breaks down organic molecules using oxygen to produce ATP, carbon dioxide, and water.

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 stage of cellular respiration does NOT occur in the mitochondria?

Accepted Answer

Glycolysis

Question 4

What is the net yield of ATP and NADH from one molecule of glucose during glycolysis?

Accepted Answer

2 ATP and 2 NADH

Question 5

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 6

In the citric acid cycle, for each turn, how many molecules of NADH and FADH2 are produced?

Accepted Answer

3 NADH and 1 FADH2

Question 7

Which process allows cells to produce ATP in the absence of oxygen?

Accepted Answer

Fermentation

Question 8

What is the primary function of brown fat in adults, as discovered by recent research?

Accepted Answer

To generate heat by dissipating the H+ gradient without producing ATP

Question 9

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group from an organic molecule to ADP, forming ATP.

Question 10

A runner exhales carbon dioxide after a race. Which statement best explains the origin of the oxygen atoms in the exhaled CO2?

Accepted Answer

They originate from the breakdown of glucose and are incorporated into CO2 during cellular respiration.

Question 11

Which chemical characteristic of oxygen makes it suitable as the final electron acceptor in cellular respiration?

Accepted Answer

Oxygen has a high electronegativity, allowing it to attract electrons strongly.

Question 12

If oxygen is absent, what effect does this have on oxidative phosphorylation?

Accepted Answer

Oxidative phosphorylation stops because electrons cannot be passed to oxygen.

Question 13

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 14

How many ATP molecules can be produced from one molecule of glucose during cellular respiration (including both substrate-level and oxidative phosphorylation)?

Accepted Answer

Up to 32 ATP

Question 15

Which metabolic pathway is regulated by feedback inhibition to control biosynthesis in cells?

Accepted Answer

Cellular respiration

Question 16

Which of the following organic molecules can be used as fuel for cellular respiration?

Accepted Answer

Carbohydrates, fats, and proteins

Question 17

During the energy investment phase of glycolysis, what happens to glucose?

Accepted Answer

It is energized by the addition of phosphate groups from ATP.

Question 18

Which of the following best explains why brown fat is more active in lean individuals when exposed to cold?

Accepted Answer

Brown fat in lean individuals is more responsive to cold, leading to increased calorie burning and heat production.

Question 19

Which step in cellular respiration is responsible for the majority of ATP production?

Accepted Answer

Oxidative phosphorylation

Cellular Respiration: How Cells Harvest Chemical Energy

Study Guide - Practice Questions

Study Guide - Flashcards