Question 1

Which of the following statements best describes the difference between anabolic and catabolic pathways in cellular metabolism?

Accepted Answer

Anabolic pathways synthesize cellular components and are endergonic, while catabolic pathways break down cellular components and are exergonic.

Question 2

Which of the following is the primary energy currency of the biological world?

Accepted Answer

Adenosine triphosphate (ATP)

Question 3

ATP contains two energy-rich phosphoanhydride bonds. What is the significance of these bonds?

Accepted Answer

They release free energy upon hydrolysis, which can be used to power cellular processes.

Question 4

Which of the following factors contributes to the highly exergonic nature of ATP hydrolysis?

Accepted Answer

Charge repulsion between adjacent phosphate groups

Question 5

In biological oxidation, what is typically removed from the substrate?

Accepted Answer

Both electrons and protons (as hydrogen atoms)

Question 6

Which coenzyme is most commonly involved in energy metabolism as an electron acceptor?

Accepted Answer

NAD+

Question 7

What is the net ATP yield from glycolysis per molecule of glucose under anaerobic conditions?

Accepted Answer

$$2$$

Question 8

Which enzyme catalyzes the phosphorylation of glucose to glucose-6-phosphate in the first step of glycolysis?

Accepted Answer

Hexokinase

Question 9

During glycolysis, which molecule is directly oxidized to generate NADH?

Accepted Answer

Glyceraldehyde-3-phosphate

Question 10

Which process regenerates NAD+ from NADH in the absence of oxygen, allowing glycolysis to continue?

Accepted Answer

Fermentation

Question 11

Which of the following is the correct summary equation for the complete aerobic oxidation of glucose?

Accepted Answer

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

Question 12

Which type of organism can function under both aerobic and anaerobic conditions?

Accepted Answer

Facultative organism

Question 13

Which of the following is a product of lactate fermentation?

Accepted Answer

Lactate

Question 14

Which of the following best explains why glycolysis is considered a highly conserved metabolic pathway?

Accepted Answer

It is present in virtually all cells, both aerobic and anaerobic.

Question 15

Which of the following is NOT a direct use of ATP in the cell?

Accepted Answer

Storage of genetic information

Question 16

Which of the following statements about catabolic pathways is correct?

Accepted Answer

They are exergonic and increase cellular entropy.

Question 17

Which of the following is a plausible consequence if a cell could not regenerate NAD+ during fermentation?

Accepted Answer

ATP production via glycolysis would stop.

Question 18

Which of the following is the correct equation for the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} \rightarrow \mathrm{ADP} + \mathrm{P_i}$$

Question 19

Which of the following is a real-world example of chemotrophic energy metabolism in humans?

Accepted Answer

Muscle cells generating ATP during exercise via glycolysis and fermentation

Chemotrophic Energy Metabolism: Glycolysis and Fermentation (Chapter 9 Study Notes)

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