$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i$$ \\ \Delta G = -7.3 \ \mathrm{kcal/mol}$

Question 1

Which of the following best describes the process shown in the first image (demolition of a building) in terms of metabolism?

Accepted Answer

Catabolic reaction, because it breaks down complex structures into simpler components.

Question 2

The second image (bodybuilder) is an example of which metabolic process?

Accepted Answer

Anabolic reaction, because it uses energy to build complex molecules like muscle proteins.

Question 3

Which law of thermodynamics is referenced in the fourth image (mouse with 'First Law of Thermodynamics' meme)?

Accepted Answer

Energy can be transferred or transformed but not created or destroyed.

Question 4

The fifth image (runner) best illustrates which type of energy?

Accepted Answer

Kinetic energy, because the runner is in motion.

Question 5

Which of the following equations correctly represents the hydrolysis of ATP as shown in the images?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i$$ \ \Delta G = -7.3 \ \mathrm{kcal/mol}$

Question 6

Which statement about exergonic and endergonic reactions is supported by the diagrams showing free energy changes?

Accepted Answer

Exergonic reactions release energy and have $$\Delta G \u003c 0.$$

Question 7

In the context of redox reactions, as shown in the sodium and chlorine reaction diagram, which atom is oxidized?

Accepted Answer

Sodium, because it loses an electron.

Question 8

Which of the following best explains why ATP has high potential energy, as shown in the ATP structure diagram?

Accepted Answer

The clustered negative charges on the phosphate groups create instability.

Question 9

Which process is illustrated by the cycle showing ATP hydrolysis and regeneration?

Accepted Answer

Energy coupling, where exergonic reactions drive endergonic reactions.

Question 10

What is the role of enzymes in chemical reactions, as shown in the activation energy diagrams?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions.

Question 11

Which of the following best describes competitive inhibition, as shown in the enzyme regulation diagram?

Accepted Answer

A molecule binds to the active site, preventing substrate binding.

Question 12

Which of the following is an example of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway binds to an enzyme early in the pathway and inhibits it.

Question 13

Which of the following statements about enzyme specificity is correct?

Accepted Answer

Each enzyme catalyzes a specific reaction with a specific substrate.

Question 14

Which of the following best explains why biological systems do not violate the second law of thermodynamics?

Accepted Answer

They increase order locally but increase disorder (entropy) in the universe overall.

Question 15

Which of the following is true about the effect of temperature on enzyme activity?

Accepted Answer

Enzymes have an optimal temperature at which they function best.

Question 16

Which of the following is a correct statement about the regeneration of ATP in cells?

Accepted Answer

ATP regeneration requires energy input from exergonic reactions such as cellular respiration.

Question 17

Which of the following best describes the role of cofactors in enzyme function?

Accepted Answer

Cofactors can be inorganic ions or organic molecules required for enzyme activity.

Question 18

Which of the following is true about the relationship between exergonic and endergonic reactions in cells?

Accepted Answer

Exergonic reactions drive endergonic reactions through energy coupling.

Question 19

Which of the following best describes the induced fit model of enzyme function?

Accepted Answer

The enzyme changes shape slightly to fit the substrate more closely, optimizing catalysis.

Energy and Enzymes: Foundations of Metabolism and Cellular Function

Study Guide - Practice Questions