Question 1

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

Accepted Answer

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

Question 2

In the context of redox reactions during cellular respiration, which statement is correct?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 3

Which of the following best explains why organic molecules with many hydrogen atoms are excellent fuels for cellular respiration?

Accepted Answer

Hydrogen atoms are a source of 'hilltop' electrons that can be transferred to oxygen, releasing energy.

Question 4

During the combustion of methane ($$CH_4$$), which molecule is reduced?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

Which of the following is the correct definition of oxidation in a redox reaction?

Accepted Answer

The loss of electrons from a substance.

Question 6

In the reaction $$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + Energy$$, what happens to the electrons from glucose?

Accepted Answer

They are transferred to oxygen, reducing it to water.

Question 7

Why is the breakdown of glucose in cellular respiration considered exergonic?

Accepted Answer

It releases free energy because the products have less energy than the reactants.

Question 8

Which molecule acts as an electron shuttle during cellular respiration, accepting electrons and hydrogen ions?

Accepted Answer

NAD$$^+$$

Question 9

What is the role of dehydrogenase enzymes in cellular respiration?

Accepted Answer

They remove a pair of hydrogen atoms from a substrate and transfer them to NAD$$^+.$$

Question 10

Which of the following best describes the fate of the hydrogen atoms removed from glucose during cellular respiration?

Accepted Answer

They are transferred to NAD$$^+$$, forming NADH.

Question 11

A patient is unable to efficiently transfer electrons from NADH to oxygen in their mitochondria. Which process would be most directly affected?

Accepted Answer

ATP synthesis via oxidative phosphorylation

Question 12

Which of the following statements about the energy released during cellular respiration is correct?

Accepted Answer

Some energy is used to synthesize ATP, while the rest is dissipated as heat.

Question 13

In a redox reaction, the substance that donates electrons is called the:

Accepted Answer

Reducing agent

Question 14

Which of the following best explains why oxygen is such an effective oxidizing agent in cellular respiration?

Accepted Answer

Oxygen is highly electronegative, attracting electrons strongly.

Question 15

If a cell is unable to regenerate NAD$$^+$$, which process would stop first?

Accepted Answer

Glycolysis

Question 16

Which of the following is a real-world example of a redox reaction similar to cellular respiration?

Accepted Answer

Combustion of gasoline in an automobile engine

Question 17

In the reaction $$Xe^- + Y \rightarrow X + Y^-$$, which substance is oxidized?

Accepted Answer

$$Xe^-$$

Question 18

Why is it necessary for the oxidation of glucose to occur in a series of steps rather than all at once?

Accepted Answer

To capture energy efficiently and avoid releasing it as heat all at once.

Question 19

Which of the following best describes the function of NADH in cellular respiration?

Accepted Answer

It carries electrons to the electron transport chain.

Question 20

A scientist adds a chemical that blocks the transfer of electrons from NADH to the electron transport chain. What immediate effect would this have on cellular respiration?

Accepted Answer

ATP production would decrease because the electron transport chain would stop.

Catabolic Pathways and Energy Production in Cellular Respiration

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