Question 1

Which of the following best describes the role of enzymes in cellular respiration?

Accepted Answer

Enzymes lower the activation energy barrier, allowing reactions to proceed more quickly.

Question 2

During cellular respiration, which molecule is oxidized and which is reduced in the overall reaction $$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O}$$?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 3

Which process in cellular respiration is responsible for producing the majority of ATP in eukaryotic cells?

Accepted Answer

Oxidative phosphorylation

Question 4

A patient with hypoglycemia is shaky and weak. Which macromolecule can be broken down to help replenish their blood glucose levels most rapidly?

Accepted Answer

Carbohydrates

Question 5

Which statement correctly describes the relationship between oxidation and reduction in redox reactions?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons; they always occur together.

Question 6

In the electron transport chain (ETC), why are electrons transferred in a stepwise fashion rather than all at once?

Accepted Answer

To release energy gradually, allowing it to be harnessed for ATP synthesis

Question 7

Which molecule acts as the final electron acceptor in aerobic cellular respiration?

Accepted Answer

O$$_2$$

Question 8

What is the primary function of NAD$$^+$$ and FAD in cellular respiration?

Accepted Answer

They serve as electron carriers, accepting electrons during redox reactions.

Question 9

Which of the following equations correctly represents the net reaction of aerobic cellular respiration?

Accepted Answer

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

Question 10

Which process occurs in the cytosol and initiates the breakdown of glucose during cellular respiration?

Accepted Answer

Glycolysis

Question 11

If a cell were unable to regenerate ATP from ADP and $$P_i$$, which cellular process would be most directly affected?

Accepted Answer

Energy coupling for chemical and mechanical work

Question 12

Which of the following best explains why cells use electron carriers like NAD$$^+$$ and FAD instead of transferring electrons directly to oxygen?

Accepted Answer

Direct transfer would release too much energy at once, which could damage the cell.

Question 13

Which of the following is an example of substrate-level phosphorylation?

Accepted Answer

Direct enzymatic transfer of a phosphate group to ADP during glycolysis

Question 14

Which statement best describes the energy transformation during cellular respiration?

Accepted Answer

Chemical energy in glucose is converted to ATP and released as heat.

Question 15

In a redox reaction, what is the role of the reducing agent?

Accepted Answer

It donates electrons and becomes oxidized.

Question 16

Which of the following statements about the citric acid cycle is correct?

Accepted Answer

It completes the oxidation of glucose derivatives, producing CO$$_2$$ and electron carriers.

Question 17

What would happen if the electron transport chain in mitochondria stopped functioning?

Accepted Answer

ATP production would decrease dramatically, and cells would rely on less efficient pathways.

Question 18

Which of the following best describes the difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration does not.

Question 19

Which of the following is a real-world consequence of impaired cellular respiration in human cells?

Accepted Answer

Decreased ATP production leading to muscle weakness and fatigue

Cellular Respiration: Energy Flow and Metabolic Pathways

Guida di studio - Domande di pratica

Study guide - Flashcard