Question 1

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

Accepted Answer

Potential energy is stored energy due to position or structure, while kinetic energy is the energy of motion.

Question 2

Which of the following is an example of kinetic energy in a biological context?

Accepted Answer

A muscle contracting during exercise.

Question 3

According to the first law of thermodynamics, which statement is correct?

Accepted Answer

Energy can be transformed or transferred, but cannot be created or destroyed.

Question 4

Which of the following images would have the highest entropy according to the second law of thermodynamics?

Accepted Answer

A messy, disorganized room.

Question 5

Why is 100% efficient energy conversion impossible in living systems?

Accepted Answer

Some energy is always lost as heat, increasing entropy.

Question 6

Which of the following statements is TRUE regarding exergonic reactions?

Accepted Answer

Exergonic reactions release energy and have a negative $$\Delta G.$$

Question 7

Which of the following is NOT a function of ATP in cellular metabolism?

Accepted Answer

Storing genetic information.

Question 8

How does ATP participate in energy-coupling reactions?

Accepted Answer

Energy released by ATP hydrolysis is used to drive endergonic reactions.

Question 9

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 10

Which environmental factor is LEAST likely to affect enzyme activity?

Accepted Answer

Color of the enzyme.

Question 11

What is the role of cofactors in enzyme activity?

Accepted Answer

They are non-protein components required for some enzymes to function.

Question 12

Which statement correctly describes competitive inhibition?

Accepted Answer

A competitive inhibitor binds to the active site of the enzyme, preventing substrate binding.

Question 13

Which of the following terms specifically describes the metabolic process of breaking down large molecules?

Accepted Answer

Catabolism.

Question 14

Which of the following is TRUE regarding anabolic pathways?

Accepted Answer

They consume energy to build polymers from monomers.

Question 15

What is the main function of negative feedback in metabolic pathways?

Accepted Answer

To inhibit the pathway when the end product accumulates.

Question 16

Which of the following statements is TRUE regarding enzyme-substrate complexes?

Accepted Answer

The substrate binds to the enzyme at the active site, forming the enzyme-substrate complex.

Question 17

Which of the following is a real-world example of an enzyme function?

Accepted Answer

Lactase breaking down lactose in the small intestine.

Question 18

Which of the following statements is TRUE regarding the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity generally increases with temperature up to an optimal point, then decreases.

Question 19

Which of the following statements is TRUE regarding feedback inhibition?

Accepted Answer

Multiple products can participate in feedback inhibition.

Question 20

Which of the following statements is TRUE regarding enzyme activation energy?

Accepted Answer

Enzymes lower the activation energy barrier for chemical reactions.

Chapter 8: An Introduction to Metabolism – Study Notes

Study Guide - Practice Questions