Question 1

The optimum reaction rate of a particular enzyme occurs at pH 7.3 at 37°C. This reaction would probably proceed faster by:

Accepted Answer

A) decreasing the pH and increasing the temperature. 
B) increasing the temperature to 38°C and keeping the pH at 7.3. 
C) increasing the pH and maintaining the temperature at 37°C. 
D) increasing both temperature and pH. 
A) decreasing the pH and increasing the temperature. 
B) increasing the temperature to 38°C and keeping the pH at 7.3. 
C) increasing the pH and maintaining the temperature at 37°C. 
D) increasing both temperature and pH.

Question 2

Which of the following lowers the activation energy of a biochemical reaction?

Accepted Answer

A) catalysts 
B) high temperature 
C) low concentration of reactants 
D) altering pH to 7 
E) high concentration of products 
A) catalysts 
B) high temperature 
C) low concentration of reactants 
D) altering pH to 7 
E) high concentration of products

Question 3

Each of the following requires 12 carbon atoms. Which of the arrangements of carbon atoms has the greatest entropy?

Accepted Answer

A) 12 molecules of carbon dioxide, CO2 
B) one molecule of the disaccharide maltose, C12H22O11 
C) two molecules of the monosaccharide glucose, C6H12O6 
D) four molecules of the monosaccharide pyruvate, C3H4O3 
A) 12 molecules of carbon dioxide, CO2 
B) one molecule of the disaccharide maltose, C12H22O11 
C) two molecules of the monosaccharide glucose, C6H12O6 
D) four molecules of the monosaccharide pyruvate, C3H4O3

Question 4

The hydrolysis of sucrose to glucose and fructose is a spontaneous reaction. However, if you dissolve sucrose in water and keep the solution overnight at room temperature, there is no detectable conversion to glucose and fructose. Why not?

Accepted Answer

A) The reaction is at equilibrium. 
B) The energy of the products is higher than the energy of the reactants. 
C) The activation energy of the reaction decreases. 
D) The reaction is endergonic. 
E) The reaction requires a catalyst. 
A) The reaction is at equilibrium. 
B) The energy of the products is higher than the energy of the reactants. 
C) The activation energy of the reaction decreases. 
D) The reaction is endergonic. 
E) The reaction requires a catalyst.

Question 5

Which of the following is NOT a common energy carrier in the cell?

Accepted Answer

A) ADP 
B) phosphate 
C) electron carriers 
D) ATP 
A) ADP 
B) phosphate 
C) electron carriers 
D) ATP

Question 6

Enzymes are important because they:

Accepted Answer

A) are structural proteins that make up bodily tissues. 
B) can enable organisms to evade the laws of thermodynamics. 
C) bind irreversibly to substrates. 
D) allow reactions to occur at body temperature. 
E) increase the body temperature of organisms. 
A) are structural proteins that make up bodily tissues. 
B) can enable organisms to evade the laws of thermodynamics. 
C) bind irreversibly to substrates. 
D) allow reactions to occur at body temperature. 
E) increase the body temperature of organisms.

Question 7

Which of the following is part of the first law of thermodynamics?

Accepted Answer

A) Energy cannot be created or destroyed. 
B) Kinetic energy is stored energy. 
C) Energy cannot be transferred or transformed. 
D) Exergonic reactions are coupled with endergonic reactions. 
E) Potential energy equals kinetic energy in a reaction. 
A) Energy cannot be created or destroyed. 
B) Kinetic energy is stored energy. 
C) Energy cannot be transferred or transformed. 
D) Exergonic reactions are coupled with endergonic reactions. 
E) Potential energy equals kinetic energy in a reaction.

Question 8

In chemical reactions, the ________ are converted into products.

Accepted Answer

The answer of In chemical reactions, the ________ are converted...

Question 9

Place these steps of enzyme catalysis in the correct order: 1. The substrate and enzyme change shape.
2) The substrate enters the active site.
3) The enzyme reverts to its original configuration.
4) The product is expelled.

Accepted Answer

A) 1, 2, 3, 4 
B) 1, 3, 4, 2 
C) 2, 1, 4, 3 
D) 2, 1, 3, 4 
E) 2, 3, 1, 4 
A) 1, 2, 3, 4 
B) 1, 3, 4, 2 
C) 2, 1, 4, 3 
D) 2, 1, 3, 4 
E) 2, 3, 1, 4

Question 10

The law of conservation of energy states that although the form of energy used remains the same, the total amount of energy changes. True or False?

Accepted Answer

A) True 
 B)False

Exam 6: Energy Flow in the Life of a Cell

The optimum reaction rate of a particular enzyme occurs at pH 7.3 at 37°C. This reaction would probably proceed faster by:

Which of the following lowers the activation energy of a biochemical reaction?

Each of the following requires 12 carbon atoms. Which of the arrangements of carbon atoms has the greatest entropy?

The hydrolysis of sucrose to glucose and fructose is a spontaneous reaction. However, if you dissolve sucrose in water and keep the solution overnight at room temperature, there is no detectable conversion to glucose and fructose. Why not?

Which of the following is NOT a common energy carrier in the cell?

Enzymes are important because they:

Which of the following is part of the first law of thermodynamics?

In chemical reactions, the ________ are converted into products.

Place these steps of enzyme catalysis in the correct order: 1. The substrate and enzyme change shape. 2) The substrate enters the active site. 3) The enzyme reverts to its original configuration. 4) The product is expelled.

The law of conservation of energy states that although the form of energy used remains the same, the total amount of energy changes. True or False?

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

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