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, while potential energy is stored energy due to position or structure.

Question 2

Thermal energy is best classified as which type of energy?

Accepted Answer

Kinetic energy

Question 3

Which statement correctly summarizes the first law of thermodynamics?

Accepted Answer

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

Question 4

According to the second law of thermodynamics, which of the following is true about energy transformations?

Accepted Answer

Every energy transformation increases the entropy (disorder) of the universe.

Question 5

Which of the following reactions is exergonic?

Accepted Answer

A reaction where $$\Delta G \u003c 0$$

Question 6

Which free energy diagram best represents an endergonic reaction?

Accepted Answer

Reactants start at a lower free energy than products; $$\Delta G \u003e 0$$

Question 7

Which of the following best defines metabolism?

Accepted Answer

All chemical reactions that occur within a living organism

Question 8

Energy coupling in cells is important because:

Accepted Answer

It allows cells to use exergonic reactions to drive endergonic reactions.

Question 9

What does ATP stand for?

Accepted Answer

Adenosine triphosphate

Question 10

Which part of the ATP molecule is directly involved in energy release during cellular work?

Accepted Answer

The terminal phosphate group

Question 11

How does ATP cycle within a cell?

Accepted Answer

ATP is synthesized from ADP and phosphate during catabolic reactions and hydrolyzed to ADP and phosphate during cellular work.

Question 12

Which statement best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts to speed up chemical reactions without being consumed.

Question 13

Enzymes speed up chemical reactions by:

Accepted Answer

Lowering the activation energy required for the reaction

Question 14

Which of the following factors does NOT affect enzymatic activity?

Accepted Answer

Color of the enzyme

Question 15

A patient has a fever of 40°C. How might this affect the activity of enzymes in their body?

Accepted Answer

Enzyme activity may decrease because high temperatures can denature enzymes.

Question 16

If a cell needs to drive an endergonic reaction ($$\Delta G \u003e 0$$), which molecule is most likely to be used to provide energy?

Accepted Answer

ATP

Question 17

Which of the following is a real-life example of energy coupling in human cells?

Accepted Answer

Using ATP hydrolysis to power muscle contraction

Question 18

Which equation correctly represents the hydrolysis of ATP?

Accepted Answer

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

Question 19

A scientist adds a competitive inhibitor to an enzyme-catalyzed reaction. What is the most likely effect?

Accepted Answer

The inhibitor binds to the active site, decreasing enzyme activity.

Question 20

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that fit only specific substrates.

Energy, Metabolism, and Enzyme Function in Biological Systems

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