Question 1

Which of the following best defines metabolism in a biological system?

Accepted Answer

The sum of all chemical reactions that occur within a cell or organism.

Question 2

Which of the following is an example of a catabolic pathway?

Accepted Answer

The breakdown of glucose during cellular respiration.

Question 3

Which statement correctly distinguishes between kinetic and potential energy?

Accepted Answer

Kinetic energy is associated with motion, while potential energy is stored due to position or structure.

Question 4

Which of the following is an example of chemical energy?

Accepted Answer

The energy stored in the bonds of ATP molecules.

Question 5

According to the first law of thermodynamics, which of the following is true?

Accepted Answer

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

Question 6

The second law of thermodynamics states that:

Accepted Answer

Every energy transfer increases the entropy of the universe.

Question 7

Which of the following best describes free energy ($$\Delta G) in a $$biological reaction?

Accepted Answer

The portion of a system's energy that can perform work when temperature and pressure are uniform.

Question 8

A reaction with $$\Delta G \u003c 0 is $$best described as:

Accepted Answer

Exergonic and spontaneous.

Question 9

Which graph best represents an endergonic reaction?

Accepted Answer

A graph where the products have higher free energy than the reactants.

Question 10

ATP is important in metabolism because:

Accepted Answer

It couples exergonic and endergonic reactions by transferring a phosphate group.

Question 11

How does ATP provide energy to cellular processes?

Accepted Answer

By transferring a phosphate group to another molecule, making it more reactive.

Question 12

Which of the following best describes activation energy ($$E_a) in a $$chemical reaction?

Accepted Answer

The initial input of energy required to start a chemical reaction.

Question 13

In a free energy diagram of a reaction requiring activation energy, what does the peak of the curve represent?

Accepted Answer

The transition state, where reactants are at their highest energy.

Question 14

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the reaction rate.

Question 15

A patient is given a drug that inhibits ATP synthesis. Which of the following processes would be most directly affected?

Accepted Answer

Active transport of ions across the cell membrane.

Question 16

If a reaction has $$\Delta G = +5$$ kcal/mol, which of the following is true?

Accepted Answer

The reaction is endergonic and requires an input of energy.

Question 17

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

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 18

Which of the following is an example of energy coupling in cells?

Accepted Answer

Using the energy released from ATP hydrolysis to drive the synthesis of macromolecules.

Question 19

A scientist measures the free energy change of a reaction and finds $$\Delta G = 0. $$What does this indicate about the reaction?

Accepted Answer

The reaction is at equilibrium and no net change is occurring.

Question 20

Which of the following best describes the role of ATP in muscle contraction?

Accepted Answer

ATP provides the energy for myosin heads to detach from actin filaments and reset for another contraction cycle.

Metabolism, Energy, Thermodynamics, ATP, and Enzymes: Study Guide

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