Question 1

Which statement about the reaction ATP + H2O → ADP + phosphate is FALSE?

Accepted Answer

A) It is catalyzed by an ATPase. 
B) It releases about 7.3 kilocalories of energy per mole. 
C) It involves the breaking of phosphoanhydride bonds. 
D) The reactants are more stable than the products. 
E) It is exergonic. 
A) It is catalyzed by an ATPase. 
B) It releases about 7.3 kilocalories of energy per mole. 
C) It involves the breaking of phosphoanhydride bonds. 
D) The reactants are more stable than the products. 
E) It is exergonic.

Question 2

Which of the following statements concerning the effect of pH on enzyme activity is FALSE?

Accepted Answer

A) Enzyme shape changes as the pH changes. 
B) The pH affects positively-charged amino acids. 
C) The pH affects negatively-charged amino acids. 
D) The binding capacity of an enzyme is affected by pH. 
E) Enzymes are always present at their pH optimum. 
A) Enzyme shape changes as the pH changes. 
B) The pH affects positively-charged amino acids. 
C) The pH affects negatively-charged amino acids. 
D) The binding capacity of an enzyme is affected by pH. 
E) Enzymes are always present at their pH optimum.

Question 3

Which of the following is NOT an example of potential energy?

Accepted Answer

A) A charged flashlight battery 
B) A boulder at the top of a hill 
C) A tank of gasoline 
D) Water at the bottom of a waterfall 
E) An apple on a branch
PAGE 66 Chapter 5 The Flow of Energy 
A) A charged flashlight battery 
B) A boulder at the top of a hill 
C) A tank of gasoline 
D) Water at the bottom of a waterfall 
E) An apple on a branch
PAGE 66 Chapter 5 The Flow of Energy

Question 4

Of the total solar energy that reaches the Earth, ______ percent is captured by the cells of photosynthetic organisms.

Accepted Answer

A) about 50 
B) about 20 
C) about 10 
D) about 5 
E) less than 1 
A) about 50 
B) about 20 
C) about 10 
D) about 5 
E) less than 1

Question 5

A negatively charged portion of a substrate molecule would most likely fit into a ______ region of its enzyme's active site.

Accepted Answer

A) positively charged 
B) negatively charged 
C) hydrophilic 
D) hydrophobic 
E) polar 
A) positively charged 
B) negatively charged 
C) hydrophilic 
D) hydrophobic 
E) polar

Question 6

For most enzyme catalyzed reactions, the rate approximately doubles for each 5C increase in temperature.

Accepted Answer

A) True 
 B)False

Question 7

A nucleotide is composed of a nucleoside plus a phosphate group.

Accepted Answer

A) True 
 B)False

Question 8

In a metabolic pathway, there is little accumulation of intermediate products.

Accepted Answer

A) True 
 B)False

Question 9

In biological reactions, when a molecule is oxidized it ______ an electron and a(n) ______.

Accepted Answer

A) loses; proton 
B) gains; proton 
C) loses; oxygen atom 
D) gains; oxygen atom 
E) loses; neutron 
A) loses; proton 
B) gains; proton 
C) loses; oxygen atom 
D) gains; oxygen atom 
E) loses; neutron

Question 10

Which of the following equations relating enthalpy, entropy, and free energy is correct?

Accepted Answer

A) ΔS = ΔH - T ΔG 
B) ΔH = ΔG - T ΔS 
C) ΔS = ΔG + T ΔH 
D) ΔG = ΔH - T ΔS 
E) ΔG = ΔH + T ΔS 
A) ΔS = ΔH - T ΔG 
B) ΔH = ΔG - T ΔS 
C) ΔS = ΔG + T ΔH 
D) ΔG = ΔH - T ΔS 
E) ΔG = ΔH + T ΔS

Question 11

An enzyme binds with its substrate at the active site.

Accepted Answer

A) True 
 B)False

Question 12

The second law of thermodynamics states that if no energy enters or leaves the system under study, the potential energy of the final state will be______ the potential energy of the initial state.

Accepted Answer

A) equal to 
B) greater than or equal to 
C) greater than 
D) less than 
E) less than or equal to 
A) equal to 
B) greater than or equal to 
C) greater than 
D) less than 
E) less than or equal to

Question 13

When energy is changed from one form to another, the total energy after the change is equal to the total energy before the change.

Accepted Answer

A) True 
 B)False

Question 14

According to the first law of thermodynamics, the total energy of ______ is ______.

Accepted Answer

A) a system; constant 
B) a system; changeable 
C) the surroundings; constant 
D) the universe; constant 
E) the universe; changeable 
A) a system; constant 
B) a system; changeable 
C) the surroundings; constant 
D) the universe; constant 
E) the universe; changeable

Question 15

Which of the following is a phosphorylation reaction catalyzed by a kinase in plant cells?

Accepted Answer

A) ATP + glucose → glucose phosphate + ADP 
B) Fructose phosphate + ADP → fructose + ATP 
C) Glucose phosphate + ADP → glucose + ATP 
D) ATP + H2O → ADP + phosphate 
E) ADP + phosphate → ATP + H2O 
A) ATP + glucose → glucose phosphate + ADP 
B) Fructose phosphate + ADP → fructose + ATP 
C) Glucose phosphate + ADP → glucose + ATP 
D) ATP + H2O → ADP + phosphate 
E) ADP + phosphate → ATP + H2O

Question 16

As the temperature increases, the rate of an enzyme-catalyzed reaction usually:

Accepted Answer

A) increases constantly. 
B) increases up to a point, then decreases. 
C) decreases constantly. 
D) decreases to a point, then increases. 
E) increases, then decreases, then increases again. 
A) increases constantly. 
B) increases up to a point, then decreases. 
C) decreases constantly. 
D) decreases to a point, then increases. 
E) increases, then decreases, then increases again.

Question 17

Picking up clothes from the floor and hanging them in a closet results in an increase in entropy.

Accepted Answer

A) True 
 B)False

Question 18

pH affects the rate of enzyme-catalyzed reactions by altering the charge on the enzyme and/or substrate(s).

Accepted Answer

A) True 
 B)False

Question 19

All enzymes are proteins.

Accepted Answer

A) True 
 B)False

Question 20

In feedback inhibition, the ______ enzyme in a metabolic pathway is inhibited by the ___________.

Accepted Answer

A) last; first substrate 
B) last; end product 
C) first; cofactor 
D) first; first substrate 
E) first; end product 
A) last; first substrate 
B) last; end product 
C) first; cofactor 
D) first; first substrate 
E) first; end product

Exam 5: The Flow of Energy

Which statement about the reaction ATP + H2O → ADP + phosphate is FALSE?

Which of the following statements concerning the effect of pH on enzyme activity is FALSE?

Which of the following is NOT an example of potential energy?

Of the total solar energy that reaches the Earth, ______ percent is captured by the cells of photosynthetic organisms.

A negatively charged portion of a substrate molecule would most likely fit into a ______ region of its enzyme's active site.

For most enzyme catalyzed reactions, the rate approximately doubles for each 5C increase in temperature.

A nucleotide is composed of a nucleoside plus a phosphate group.

In a metabolic pathway, there is little accumulation of intermediate products.

In biological reactions, when a molecule is oxidized it ______ an electron and a(n) ______.

Which of the following equations relating enthalpy, entropy, and free energy is correct?

An enzyme binds with its substrate at the active site.

The second law of thermodynamics states that if no energy enters or leaves the system under study, the potential energy of the final state will be______ the potential energy of the initial state.

When energy is changed from one form to another, the total energy after the change is equal to the total energy before the change.

According to the first law of thermodynamics, the total energy of ______ is ______.

Which of the following is a phosphorylation reaction catalyzed by a kinase in plant cells?

As the temperature increases, the rate of an enzyme-catalyzed reaction usually:

Picking up clothes from the floor and hanging them in a closet results in an increase in entropy.

pH affects the rate of enzyme-catalyzed reactions by altering the charge on the enzyme and/or substrate(s).

All enzymes are proteins.

In feedback inhibition, the ______ enzyme in a metabolic pathway is inhibited by the ___________.

Botany: an Introduction

The Molecular Composition of Plant Cells

The Plant Cell and the Cell Cycle

The Movement of Substances Into and Out of Cells

Respiration

Photosynthesis, Light, and Life

Sexual Reproduction and Heredity

The Chemistry of Heredity and Gene Expression

Recombinant Dna Technology, Plant Biotechnology, and Genomics

The Process of Evolution

Systematics: the Science of Biological Diversity

Prokaryotes and Viruses

Fungi

Protists: Algae and Heterotrophic Protists

Bryophytes

Seedless Vascular Plants

Gymnosperms

Introduction to the Angiosperms

Evolution of the Angiosperms

Plants and People

Early Development of the Plant Body

Cells and Tissues of the Plant Body

The Root: Structure and Development

The Shoot: Primary Structure and Development

Secondary Growth in Stems

Regulating Growth and Development: the Plant Hormones

External Factors and Plant Growth

Plant Nutrition and Soils

The Movement of Water and Solutes in Plants

The Dynamics of Communities and Ecosystems

Global Ecology

Filters

Which statement about the reaction ATP + H₂O → ADP + phosphate is FALSE?

In biological reactions, when a molecule is oxidized it an electron and a(n) .

According to the first law of thermodynamics, the total energy of is .

In feedback inhibition, the enzyme in a metabolic pathway is inhibited by the _____.