Question 1

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

Accepted Answer

Catabolic pathways break down complex molecules into simpler ones, releasing energy; anabolic pathways build complex molecules from simpler ones, requiring energy input.

Question 2

Which equation correctly represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 3

A reaction has $$\Delta G = -30 kJ/$$mol. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and spontaneous.

Question 4

Which of the following is NOT a function of enzymes in metabolic reactions?

Accepted Answer

Changing the overall free energy change ($$\Delta G) of a $$reaction.

Question 5

ATP is often described as the 'energy currency' of the cell. Which statement best explains why?

Accepted Answer

ATP contains high-energy phosphate bonds that, when hydrolyzed, release energy to drive endergonic reactions.

Question 6

Which of the following best describes the role of competitive inhibitors in enzyme activity?

Accepted Answer

They bind to the enzyme's active site, preventing substrate binding.

Question 7

During cellular respiration, which metabolic pathway directly produces the most ATP?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 8

Which of the following is an example of an anabolic pathway?

Accepted Answer

Fatty acid synthesis (lipogenesis)

Question 9

A patient is exposed to nerve gas, which inhibits acetylcholinesterase. What type of enzyme inhibition is this?

Accepted Answer

Competitive inhibition

Question 10

Which statement about the laws of thermodynamics is correct in the context of metabolism?

Accepted Answer

Every energy transfer increases the entropy of the universe.

Question 11

Which of the following would most likely decrease the rate of an enzyme-catalyzed reaction?

Accepted Answer

Adding a noncompetitive inhibitor

Question 12

Which process is responsible for the breakdown of glucose to pyruvate in the cytosol?

Accepted Answer

Glycolysis

Question 13

Which of the following is a correct example of energy coupling in cells?

Accepted Answer

Using the energy released from ATP hydrolysis to drive the synthesis of proteins.

Question 14

Which of the following statements about feedback inhibition is true?

Accepted Answer

It prevents a cell from wasting chemical resources by inhibiting the first enzyme in a pathway when the end product accumulates.

Question 15

Which of the following is NOT a way enzymes lower the activation energy ($$E_a) of a $$reaction?

Accepted Answer

Changing the overall $$\Delta G of $$the reaction

Question 16

Which metabolic pathway is shared by both aerobic and anaerobic respiration?

Accepted Answer

Glycolysis

Question 17

A cell is placed in an environment with a pH far outside its optimal range. What is the most likely effect on its enzymes?

Accepted Answer

Enzyme activity will decrease due to denaturation or altered active site.

Question 18

Which of the following is a real-world example of a noncompetitive inhibitor?

Accepted Answer

Glyphosate (Roundup herbicide)

Question 19

Which of the following best explains why cells create ordered structures despite the second law of thermodynamics?

Accepted Answer

Cells create order locally by increasing disorder elsewhere, such as releasing heat.

Question 20

Which of the following is true about the localization of enzymes within a cell?

Accepted Answer

Enzymes for cellular respiration are located in mitochondria.

Metabolism: Chemical Processes of Life

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