Question 1

Energy is defined as the capacity to do work. True or False?

Accepted Answer

A) True 
 B)False

Question 2

Which statement BEST describes the relationship between an enzyme and a reactant?

Accepted Answer

A) The relationship is temporary. 
B) Covalent chemical bonds stabilize the relationship. 
C) The enzyme and the reactant molecule are both permanently changed. 
D) The resultant product and the enzyme are permanently bonded together. 
E) The reactant cannot function without the enzyme. 
A) The relationship is temporary. 
B) Covalent chemical bonds stabilize the relationship. 
C) The enzyme and the reactant molecule are both permanently changed. 
D) The resultant product and the enzyme are permanently bonded together. 
E) The reactant cannot function without the enzyme.

Question 3

In the liver, the polysaccharide glycogen is broken down into glucose monomers. The glucose molecules are then released into the blood when blood sugar levels need to be raised. This process is an example of a(n)________ reaction.

Accepted Answer

A) endergonic 
B) exergonic 
C) kinetic 
D) potential 
A) endergonic 
B) exergonic 
C) kinetic 
D) potential

Question 4

When solid sodium hydroxide is added to water, the solution gets hot. This is an example of:

Accepted Answer

A) an endergonic process. 
B) an exergonic process. 
C) an enzyme-catalyzed process. 
D) a release of activation energy. 
E) a conversion of kinetic energy to potential energy. 
A) an endergonic process. 
B) an exergonic process. 
C) an enzyme-catalyzed process. 
D) a release of activation energy. 
E) a conversion of kinetic energy to potential energy.

Question 5

Special molecules such as NAD+ and FAD transport ________ in cells, which can then be used as energy in the cell.

Accepted Answer

The answer of Special molecules such as NAD+ and FAD...

Question 6

Which of the following is the organic molecule that is sometimes required for certain enzyme activity?

Accepted Answer

A) an accessory enzyme 
B) an allosteric enzyme 
C) a coenzyme 
D) a functional group 
E) an activator 
A) an accessory enzyme 
B) an allosteric enzyme 
C) a coenzyme 
D) a functional group 
E) an activator

Question 7

For many enzymes, the rate of product formation increases as the concentration of the substrate increases. Eventually the rate of the reaction reaches a maximum at which further increases in the concentration of the substrate have no effect. Why?

Accepted Answer

A) At high concentrations of substrate, all of the enzyme molecules are bound to substrate molecules. 
B) At high concentrations of substrate, the activation energy of the reaction increases. 
C) At high concentrations of substrate, the activation energy of the reaction decreases. 
D) The enzyme is no longer specific for the substrate. 
E) At high concentrations of substrate, the reaction is endergonic. 
A) At high concentrations of substrate, all of the enzyme molecules are bound to substrate molecules. 
B) At high concentrations of substrate, the activation energy of the reaction increases. 
C) At high concentrations of substrate, the activation energy of the reaction decreases. 
D) The enzyme is no longer specific for the substrate. 
E) At high concentrations of substrate, the reaction is endergonic.

Question 8

ATP is considered a short-term form of energy for the cell, whereas ________ represent more stable, long-term energy stores.

Accepted Answer

carbohydra

Question 9

________ are biological catalysts.

Accepted Answer

The answer of ________ are biological catalysts....

Question 10

The reactant in an enzyme-catalyzed reaction is the:

Accepted Answer

A) substrate. 
B) active site. 
C) product. 
D) inhibitor. 
E) activation energy. 
A) substrate. 
B) active site. 
C) product. 
D) inhibitor. 
E) activation energy.

Question 11

Competitive and noncompetitive enzyme inhibitors differ with respect to:

Accepted Answer

A) the precise location on the enzyme to which they bind. 
B) their pH. 
C) their binding affinities. 
D) their energies of activation. 
A) the precise location on the enzyme to which they bind. 
B) their pH. 
C) their binding affinities. 
D) their energies of activation.

Question 12

Which of these statements regarding enzymes is FALSE?

Accepted Answer

A) Enzymes are proteins that function as biological catalysts. 
B) Enzymes display specificity for certain molecules to which they attach. 
C) Enzymes provide energy for the reactions they catalyze. 
D) The activity of enzymes can be regulated by factors in their environment. 
E) An enzyme may be used many times for a specific reaction. 
A) Enzymes are proteins that function as biological catalysts. 
B) Enzymes display specificity for certain molecules to which they attach. 
C) Enzymes provide energy for the reactions they catalyze. 
D) The activity of enzymes can be regulated by factors in their environment. 
E) An enzyme may be used many times for a specific reaction.

Question 13

The usual source of activation energy for a reaction is potential energy stored by the cell. True or False?

Accepted Answer

A) True 
 B)False

Question 14

Energy that is not converted to useful energy is usually given off as:

Accepted Answer

A) radioactivity. 
B) electricity. 
C) light. 
D) heat. 
E) entropy. 
A) radioactivity. 
B) electricity. 
C) light. 
D) heat. 
E) entropy.

Question 15

Certain vitamins, such as niacin, act as _______ in enzyme-catalyzed reactions.

Accepted Answer

A) substrates 
B) allosteric activators 
C) coenzymes 
D) inhibitors 
E) catalysts 
A) substrates 
B) allosteric activators 
C) coenzymes 
D) inhibitors 
E) catalysts

Question 16

Normally, a certain enzyme has maximum activity at 37°C, but once it has been heated to 100°C and then cooled back down to 37°C, the enzyme is no longer active. Why?

Accepted Answer

The enzyme's three-dimensional

Question 17

Which of the following will bind to the active site of an enzyme?

Accepted Answer

A) substrate only 
B) competitive inhibitor only 
C) allosteric inhibitor only 
D) noncompetitive inhibitor only 
E) both substrate and competitive inhibitor 
A) substrate only 
B) competitive inhibitor only 
C) allosteric inhibitor only 
D) noncompetitive inhibitor only 
E) both substrate and competitive inhibitor

Question 18

Similar to a car, a human body is about ________ efficient in converting chemical energy to movement.

Accepted Answer

A) 1% 
B) 25% 
C) 75% 
D) 95% 
A) 1% 
B) 25% 
C) 75% 
D) 95%

Question 19

Sitting at the top of a slide, a child has ________ energy; sliding down, she is using ________ energy.

Accepted Answer

The answer of Sitting at the top of a slide,...

Question 20

Briefly describe the difference between kinetic energy and potential energy, and give an example of each.

Accepted Answer

Kinetic energy is the energy of motion (

Exam 6: Energy Flow in the Life of a Cell

Energy is defined as the capacity to do work. True or False?

Which statement BEST describes the relationship between an enzyme and a reactant?

In the liver, the polysaccharide glycogen is broken down into glucose monomers. The glucose molecules are then released into the blood when blood sugar levels need to be raised. This process is an example of a(n)________ reaction.

When solid sodium hydroxide is added to water, the solution gets hot. This is an example of:

Special molecules such as NAD+ and FAD transport ________ in cells, which can then be used as energy in the cell.

Which of the following is the organic molecule that is sometimes required for certain enzyme activity?

For many enzymes, the rate of product formation increases as the concentration of the substrate increases. Eventually the rate of the reaction reaches a maximum at which further increases in the concentration of the substrate have no effect. Why?

ATP is considered a short-term form of energy for the cell, whereas ________ represent more stable, long-term energy stores.

________ are biological catalysts.

The reactant in an enzyme-catalyzed reaction is the:

Competitive and noncompetitive enzyme inhibitors differ with respect to:

Which of these statements regarding enzymes is FALSE?

The usual source of activation energy for a reaction is potential energy stored by the cell. True or False?

Energy that is not converted to useful energy is usually given off as:

Certain vitamins, such as niacin, act as _______ in enzyme-catalyzed reactions.

Normally, a certain enzyme has maximum activity at 37°C, but once it has been heated to 100°C and then cooled back down to 37°C, the enzyme is no longer active. Why?

Which of the following will bind to the active site of an enzyme?

Similar to a car, a human body is about ________ efficient in converting chemical energy to movement.

Sitting at the top of a slide, a child has ________ energy; sliding down, she is using ________ energy.

Briefly describe the difference between kinetic energy and potential energy, and give an example of each.

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

How Do Ecosystems Work

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

Filters

Sitting at the top of a slide, a child has energy; sliding down, she is using energy.