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

Question 1

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

Accepted Answer

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

Question 2

Where does glycolysis occur within the cell?

Accepted Answer

In the cytosol

Question 3

During cellular respiration, which molecule is oxidized and which is reduced?

Accepted Answer

Glucose is oxidized; oxygen is reduced

Question 4

What is the main purpose of cellular respiration in cells?

Accepted Answer

To convert the energy in glucose and other food to a form that cells can use for work

Question 5

Which stage of cellular respiration produces the most ATP?

Accepted Answer

Oxidative Phosphorylation

Question 6

What is the role of NADH in cellular respiration?

Accepted Answer

It stores energy and donates electrons to the electron transport chain

Question 7

Why is glycolysis thought to be one of the first metabolic pathways to have evolved?

Accepted Answer

It occurs in nearly all organisms and does not require oxygen

Question 8

Which of the following best describes a redox reaction?

Accepted Answer

A reaction where electrons are transferred between reactants

Question 9

If a cell has an abundance of ATP, how is cellular respiration regulated?

Accepted Answer

ATP inhibits key enzymes in glycolysis and the citric acid cycle

Question 10

What would happen to cellular respiration if a drug like cyanide inhibited the electron transport chain?

Accepted Answer

The electron transport chain would cease to operate, stopping ATP synthesis by oxidative phosphorylation

Question 11

Which cellular compartment is the site of the citric acid cycle?

Accepted Answer

Mitochondrial matrix

Question 12

What is the net gain of ATP for each glucose molecule that enters glycolysis in the absence of oxygen?

Accepted Answer

Little bit ATP

Question 13

During oxidative phosphorylation, what is the immediate source of energy that drives ATP synthesis by ATP synthase?

Accepted Answer

The proton electrochemical gradient across the inner mitochondrial membrane

Question 14

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

Molecular oxygen ($$O_2)$$

Question 15

Which of the following is a product of the citric acid cycle?

Accepted Answer

NADH

Question 16

In the context of cellular respiration, what does 'oxidation' mean?

Accepted Answer

Loss of electrons

Question 17

Which process allows cells to produce ATP without the use of oxygen?

Accepted Answer

Fermentation

Question 18

What is the main difference between aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, fermentation does not

Question 19

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

Accepted Answer

They are released as carbon dioxide ($$CO_2)$$

Question 20

A patient is exposed to a drug that blocks the flow of electrons through the electron transport chain. What is the most likely outcome?

Accepted Answer

ATP production by oxidative phosphorylation will decrease

Cellular Respiration: Mechanisms and Energy Yield

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