Question 1

Which of the following best describes a catabolic pathway in cellular metabolism?

Accepted Answer

A pathway that breaks down complex molecules into simpler compounds, releasing energy.

Question 2

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

Accepted Answer

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

Question 3

A diver climbs up a platform, converting the kinetic energy of muscle movement into potential energy. Which type of energy transformation does this scenario illustrate?

Accepted Answer

Kinetic energy to potential energy

Question 4

Which equation correctly represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 5

Which of the following statements about spontaneous processes is TRUE?

Accepted Answer

Spontaneous processes increase the entropy of the universe.

Question 6

A chemical reaction has $$\Delta G \u003c 0. $$What does this indicate about the reaction?

Accepted Answer

The reaction is spontaneous and releases free energy.

Question 7

Which of the following best explains why cells are not closed systems and do not reach metabolic equilibrium?

Accepted Answer

Cells constantly exchange energy and matter with their surroundings.

Question 8

ATP hydrolysis is represented by the following equation: $$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i. $$What type of reaction is this and what is its significance?

Accepted Answer

It is an exergonic reaction that releases energy for cellular work.

Question 9

Which of the following is NOT a way enzymes lower the activation energy ($$E_a) of a $$reaction?

Accepted Answer

Increasing the temperature of the reaction environment

Question 10

Competitive inhibitors affect enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding

Question 11

Which of the following best describes allosteric regulation of enzymes?

Accepted Answer

A molecule binds to a site other than the active site, changing enzyme shape and activity.

Question 12

Feedback inhibition in metabolic pathways is best illustrated by:

Accepted Answer

The end product of a pathway binding to an enzyme early in the pathway to inhibit its activity.

Question 13

Which of the following forms of energy is stored in the arrangement of electrons in chemical bonds?

Accepted Answer

Chemical energy

Question 14

If a reaction in a cell reaches equilibrium, what is the consequence for the cell?

Accepted Answer

The cell will no longer be able to do work and may die.

Question 15

Which of the following is a real-life example of chemical work performed by ATP in cells?

Accepted Answer

Synthesis of polymers from monomers

Question 16

Which statement about enzyme specificity is correct?

Accepted Answer

An enzyme is specific to its substrate due to the shape of its active site.

Question 17

Which of the following would most likely decrease the rate of an enzymatic reaction?

Accepted Answer

Raising the temperature above the enzyme's optimal range

Question 18

Which of the following is an example of mechanical work performed by ATP in cells?

Accepted Answer

Contraction of muscle fibers

Question 19

Which of the following best describes the role of organelles in metabolic regulation?

Accepted Answer

Organelles create microenvironments to separate and regulate metabolic reactions.

Question 20

A cell is exposed to a noncompetitive inhibitor. What is the most likely effect on enzyme activity?

Accepted Answer

The inhibitor binds to a different site, altering the enzyme's shape and reducing activity.

Introduction to Metabolism and Bioenergetics

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