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

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

Question 1

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

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 2

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

2 ATP

Question 3

Which molecule acts as an important electron carrier during cellular respiration by accepting electrons and becoming reduced?

Accepted Answer

NAD$$^+$$

Question 4

Where in the mitochondrion does the citric acid cycle occur?

Accepted Answer

Mitochondrial matrix

Question 5

Which stage of cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 6

What is the primary purpose of the energy investment phase of glycolysis?

Accepted Answer

To phosphorylate glucose and make it more reactive

Question 7

During the redox reactions in cellular respiration, which molecule is oxidized and which is reduced?

Accepted Answer

Glucose is oxidized; oxygen is reduced

Question 8

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

Accepted Answer

Oxidative phosphorylation

Question 9

Which of the following is NOT a product of the citric acid cycle per turn?

Accepted Answer

Glucose

Question 10

What is the fate of pyruvate produced during glycolysis under aerobic conditions?

Accepted Answer

It is transported into the mitochondria and converted to acetyl-CoA

Question 11

Which enzyme catalyzes the first step of glycolysis, phosphorylating glucose to glucose-6-phosphate?

Accepted Answer

Hexokinase

Question 12

How many NADH molecules are produced per glucose molecule during glycolysis?

Accepted Answer

2 NADH

Question 13

Which of the following best explains why ATP is considered a 'rechargeable battery' in cellular metabolism?

Accepted Answer

ATP can be hydrolyzed to ADP and then regenerated from ADP by phosphorylation

Question 14

In the link reaction (pyruvate oxidation), what are the products formed from one molecule of pyruvate?

Accepted Answer

1 acetyl-CoA, 1 NADH, 1 CO$$_2$$

Question 15

Which process occurs in the cytoplasm of eukaryotic cells?

Accepted Answer

Glycolysis

Question 16

A patient is diagnosed with a genetic defect that impairs the function of NAD$$^+ in $$their cells. Which cellular process would be most directly affected?

Accepted Answer

Redox reactions in glycolysis and the citric acid cycle

Question 17

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It directly transfers a phosphate group from a substrate to ADP to form ATP

Question 18

During glycolysis, which step is considered the 'commitment step' and is highly regulated?

Accepted Answer

Phosphorylation of fructose-6-phosphate to fructose-1,6-bisphosphate

Question 19

Which of the following is a key regulatory enzyme in glycolysis that is allosterically inhibited by ATP?

Accepted Answer

Phosphofructokinase

Cellular Respiration: Glycolysis, Pyruvate Oxidation, and the Citric Acid Cycle

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