Question 1

Which of the following best describes the First Law of Thermodynamics as it applies to biological systems?

Accepted Answer

Energy can be transformed from one form to another, but cannot be created or destroyed.

Question 2

A diver climbs to the top of a platform, then jumps into the water. Which of the following best describes the energy transformations that occur?

Accepted Answer

Potential energy is converted to kinetic energy as the diver falls.

Question 3

According to the Second Law of Thermodynamics, what happens to the total amount of usable energy in a closed system after repeated energy transformations?

Accepted Answer

It decreases, and some energy is lost as heat, increasing entropy.

Question 4

Which of the following reactions is most likely to have a negative $$\Delta G$$ value?

Accepted Answer

The breakdown of glucose to carbon dioxide and water.

Question 5

What is the main function of ATP in cellular metabolism?

Accepted Answer

To couple exergonic and endergonic reactions by providing energy.

Question 6

Which of the following best explains why the hydrolysis of ATP releases a large amount of energy?

Accepted Answer

The electrostatic repulsion between phosphate groups makes the bonds unstable and easy to break.

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed.

Question 8

A cell is building a protein from amino acids. Which of the following best describes this process?

Accepted Answer

It is an anabolic, endergonic reaction with $$\Delta G \u003e 0.$$

Question 9

Which of the following is an example of potential energy in a biological system?

Accepted Answer

The concentration gradient of protons across a mitochondrial membrane.

Question 10

In the context of redox reactions, which statement is true?

Accepted Answer

Oxidation is the loss of electrons and is energetically favorable.

Question 11

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the flow of protons down their concentration gradient to synthesize ATP from ADP and phosphate.

Question 12

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

Accepted Answer

The reaction is exergonic and releases energy.

Question 13

Which of the following scenarios best illustrates the Second Law of Thermodynamics in a living system?

Accepted Answer

A moose eating a plant and releasing heat as it moves.

Question 14

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

Accepted Answer

Exergonic reactions provide the energy required to drive endergonic reactions.

Question 15

Which of the following best describes the relationship between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways release energy by breaking down molecules, while anabolic pathways require energy to build molecules.

Question 16

Which of the following equations correctly represents the change in internal energy according to the First Law of Thermodynamics?

Accepted Answer

$$\Delta U = Q - W$$

Question 17

Which of the following is a direct consequence of increasing entropy in a biological system?

Accepted Answer

The system becomes more disordered and less energy is available to do work.

Question 18

Which of the following best explains why enzymes do not affect the $$\Delta G of a $$reaction?

Accepted Answer

Enzymes lower the activation energy but do not change the overall energy difference between reactants and products.

Question 19

Which of the following is an example of an exergonic reaction in a cell?

Accepted Answer

The hydrolysis of ATP to ADP and phosphate.

Question 20

Which of the following statements about redox reactions is correct?

Accepted Answer

Reduction involves the gain of electrons and is energetically unfavorable.

Energy and Metabolism: Thermodynamics, ATP, and Enzymes in Biology

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