$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy} $$

Question 1

Which of the following best describes the difference between kinetic and potential energy in biological systems?

Accepted Answer

Kinetic energy is the energy of motion, such as heat or light, while potential energy is stored energy, such as in chemical bonds.

Question 2

According to the First Law of Thermodynamics, which of the following statements is correct?

Accepted Answer

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

Question 3

A cyclist at the top of a hill has which type of energy, and what happens to it as they ride down?

Accepted Answer

Potential energy, which is converted to kinetic energy as they descend.

Question 4

Which chemical bond configuration has the highest potential energy?

Accepted Answer

Weak bonds with equally shared electrons.

Question 5

Which equation correctly represents the exergonic hydrolysis of ATP?

Accepted Answer

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy} $$

Question 6

Which statement about the Second Law of Thermodynamics is true?

Accepted Answer

Energy systems have a tendency to increase their entropy, meaning energy disperses.

Question 7

In a redox reaction, what happens during oxidation?

Accepted Answer

An atom loses electrons or electrons move away from the nucleus.

Question 8

Which of the following is an example of an endergonic reaction in cells?

Accepted Answer

Photosynthesis: input of light energy to produce energy-rich glucose.

Question 9

What is the role of ATP in energy coupling within cells?

Accepted Answer

ATP absorbs energy from exergonic reactions and uses it to drive endergonic ones.

Question 10

Which of the following best describes an exergonic chemical reaction?

Accepted Answer

A reaction that releases energy and has reactants with more free energy than products.

Question 11

Which process is an example of energetic coupling in cells?

Accepted Answer

Hydrolysis of ATP is coupled to phosphorylation of another molecule.

Question 12

What is the main function of enzymes in biological systems?

Accepted Answer

Enzymes act as biological catalysts, lowering activation energy and speeding up reactions.

Question 13

Which of the following statements about ATP hydrolysis is correct?

Accepted Answer

ATP hydrolysis is an exergonic process that releases energy.

Question 14

During a redox reaction in cells, which molecule acts as the oxidizing agent?

Accepted Answer

The molecule that gains electrons.

Question 15

Which of the following is true about the phosphate groups in ATP?

Accepted Answer

They are negatively charged and can be broken by hydrolysis.

Question 16

Which of the following best explains why weak bonds with equally shared electrons have high potential energy?

Accepted Answer

Because the electrons are loosely held, making the bond unstable and energy-rich.

Question 17

Which of the following is NOT a major type of cellular work powered by ATP?

Accepted Answer

Storage of genetic information in DNA.

Question 18

Which of the following reactions is most likely to be spontaneous?

Accepted Answer

An exergonic reaction with reactants having more free energy than products.

Question 19

Which statement best describes the role of NAD+ in cellular redox reactions?

Accepted Answer

NAD+ acts as an oxidizing agent, accepting electrons.

Question 20

Which of the following is a correct example of energy transformation in a chemical reaction?

Accepted Answer

Breaking weak, equally shared bonds to release high potential energy.

Energy and Enzymes: Foundations of Cellular Processes

Study Guide - Practice Questions