Question 1

Which of the following best describes the main difference between autotrophs and heterotrophs in terms of their carbon source for metabolism?

Accepted Answer

Autotrophs obtain carbon from CO$$_2$$ gas, while heterotrophs obtain carbon from organic molecules.

Question 2

Which of the following equations correctly represents cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{ATP}$$

Question 3

During which stage of cellular respiration is the majority of ATP produced, and what is the main process responsible for this production?

Accepted Answer

Electron Transport Chain/Oxidative Phosphorylation; chemiosmosis

Question 4

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Reduction is the gain of electrons, as seen when NAD$$^+$$ becomes NADH.

Question 5

A scientist isolates mitochondria and provides them with ADP, inorganic phosphate, and NADH, but no oxygen. Which of the following outcomes is most likely?

Accepted Answer

Neither the electron transport chain nor ATP synthesis will proceed efficiently.

Question 6

Which of the following best explains why cellular respiration is considered a catabolic process?

Accepted Answer

It breaks down glucose into smaller molecules, releasing energy.

Question 7

In eukaryotic cells, where does the Krebs cycle occur?

Accepted Answer

Mitochondrial matrix

Question 8

Which enzyme is directly responsible for synthesizing ATP during chemiosmosis in mitochondria?

Accepted Answer

ATP synthase

Question 9

Which of the following is a key difference between lactic acid fermentation and alcoholic fermentation?

Accepted Answer

Alcoholic fermentation produces ethyl alcohol and CO$$_2$$, while lactic acid fermentation produces lactic acid.

Question 10

Which of the following best describes the flow of energy and cycling of carbon in an ecosystem?

Accepted Answer

Energy flows through the ecosystem and is eventually lost as heat, while carbon cycles among organisms and the environment.

Question 11

Which of the following correctly matches the process with its ATP yield and oxygen requirement?

Accepted Answer

Krebs Cycle: 2 ATP, requires oxygen

Question 12

How does the location of cellular respiration differ between prokaryotes and eukaryotes?

Accepted Answer

Eukaryotes use mitochondria, while prokaryotes use the cytoplasm and cell membrane.

Question 13

Which of the following molecules can be metabolized to produce ATP in humans, in addition to glucose?

Accepted Answer

Fats, proteins, and other carbohydrates

Question 14

A marathon runner experiences muscle cramps during a race. Which metabolic process is most likely responsible for the buildup of lactic acid in their muscles?

Accepted Answer

Lactic acid fermentation

Question 15

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The movement of H$$^+$$ ions from the intermembrane space to the matrix through ATP synthase, generating ATP.

Question 16

Which of the following is true about fermentation?

Accepted Answer

It allows glycolysis to continue in the absence of oxygen.

Question 17

If a cell's mitochondria are damaged and unable to function, which process can still produce ATP?

Accepted Answer

Glycolysis

Question 18

Which of the following is a correct statement about the relationship between photosynthesis and cellular respiration?

Accepted Answer

The products of cellular respiration are the reactants for photosynthesis.

Question 19

Which of the following best explains why NADH is considered a high-energy molecule?

Accepted Answer

It has gained electrons, increasing its free energy compared to NAD$$^+.$$

Question 20

A patient is diagnosed with a genetic disorder that prevents the formation of the mitochondrial inner membrane. Which step of cellular respiration would be most directly affected?

Accepted Answer

Electron transport chain/oxidative phosphorylation

Chapter 9 Study Guide – Cellular Respiration and Metabolism (Bio 101)

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