Q: Which of the following equations represents the use of ATP in the cell?

$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P} + \text{energy}$$

Question 1

Which of the following best describes the overall chemical equation for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \sim 38\ \mathrm{ATP}$$

Question 2

Where in the cell does glycolysis occur?

Accepted Answer

Cytoplasm

Question 3

Which process produces the majority of ATP during cellular respiration?

Accepted Answer

Electron transport chain (oxidative phosphorylation)

Question 4

What is the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons and becoming reduced to NADH.

Question 5

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which one molecule loses electrons (oxidation) and another gains electrons (reduction).

Question 6

During which step of cellular respiration is CO$$_2$$ first released?

Accepted Answer

Conversion of pyruvate to acetyl-CoA (pyruvate oxidation)

Question 7

Which enzyme is responsible for catalyzing the addition of a phosphate group to ADP to form ATP?

Accepted Answer

ATP synthase

Question 8

What is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate to ADP, while oxidative phosphorylation uses energy from electrons to power ATP synthesis.

Question 9

Which molecule is less energetic as an electron carrier in cellular respiration?

Accepted Answer

FADH$$_2$$

Question 10

A patient is unable to efficiently produce ATP in their mitochondria. Which step of cellular respiration is most likely impaired?

Accepted Answer

Electron transport chain

Question 11

Which of the following best describes the process of isomerization during glycolysis?

Accepted Answer

The rearrangement of glucose-6-phosphate to fructose-6-phosphate by an isomerase enzyme.

Question 12

Which of the following equations represents the use of ATP in the cell?

Accepted Answer

$$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{P} + 	ext{energy}$$

Question 13

Which of the following is a correct statement about phosphorylation?

Accepted Answer

It is the addition of a phosphate group to a molecule, often making it more energized.

Question 14

Which of the following best explains why the breakdown of glucose in cellular respiration is a controlled process?

Accepted Answer

Energy is released in small steps via redox reactions, allowing the cell to capture energy as ATP.

Question 15

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

Accepted Answer

Glycolysis → Krebs cycle → Electron transport chain

Question 16

A mutation prevents the function of kinases in a cell. Which process would be directly affected?

Accepted Answer

Phosphorylation

Question 17

Which of the following best describes the fate of electrons carried by NADH and FADH$$_2$$ during cellular respiration?

Accepted Answer

They are transferred to the electron transport chain, where their energy is used to produce ATP.

Question 18

Which of the following is a real-life example of decarboxylation in cellular respiration?

Accepted Answer

The conversion of pyruvate to acetyl-CoA, releasing CO$$_2.$$

Question 19

If a cell is deprived of oxygen, which step of cellular respiration will be directly inhibited?

Accepted Answer

Electron transport chain

Cellular Respiration: Mechanisms and Key Molecules

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