Question 1

Which statement about the difference between ionic bonds and covalent bonds is true?

Accepted Answer

A)  An ionic bond is stronger than a covalent bond. 
B)  A covalent bond occurs only in nonpolar molecules. 
C)  An ionic bond occurs more often in aqueous solutions. 
D)  An ionic bond occurs only in liquid methane. 
E)  Electron sharing is more equal in the covalent bond. 
A)  An ionic bond is stronger than a covalent bond. 
B)  A covalent bond occurs only in nonpolar molecules. 
C)  An ionic bond occurs more often in aqueous solutions. 
D)  An ionic bond occurs only in liquid methane. 
E)  Electron sharing is more equal in the covalent bond.

Question 2

Nitrogen-14 and nitrogen-15 are isotopes,and nitrogen-15 is used to determine protein structure.Based on this information,one can conclude that nitrogen-15 has _______ nitrogen-14.

Accepted Answer

A)  more protons than 
B)  more neutrons than 
C)  more electrons than 
D)  an electronic configuration that is different from that of 
E)  the same number of protons and neutrons as 
A)  more protons than 
B)  more neutrons than 
C)  more electrons than 
D)  an electronic configuration that is different from that of 
E)  the same number of protons and neutrons as

Question 3

Phosphorus has an atomic number of 15,and on average phosphorus atoms have a total of 30.974 protons and neutrons.From this information one can conclude that this element

Accepted Answer

A)  has isotopes. 
B)  forms isomers. 
C)  dissolves in liquid methane. 
D)  is an ion. 
E)  is radioactive. 
A)  has isotopes. 
B)  forms isomers. 
C)  dissolves in liquid methane. 
D)  is an ion. 
E)  is radioactive.

Question 4

You are given two identical vials of what you are told are identical molecules.However,one vial weighs more than the other,albeit on a very minute scale.One sample weighs more per molecule because the component elements have

Accepted Answer

A)  different isotopes. 
B)  an integer atomic mass value. 
C)  more than one atomic number. 
D)  various means of forming chemical bonds. 
E)  different isomers. 
A)  different isotopes. 
B)  an integer atomic mass value. 
C)  more than one atomic number. 
D)  various means of forming chemical bonds. 
E)  different isomers.

Question 5

All of these molecules are considered to be nonpolar except for

Accepted Answer

A)  O2. 
B)  N2. 
C)  CH4. 
D)  NaCl. 
E)  H2. 
A)  O2. 
B)  N2. 
C)  CH4. 
D)  NaCl. 
E)  H2.

Question 6

The arrangement of glycosidic linkages in _______ makes it a much more stable molecule than _______.

Accepted Answer

A)  guanine;cytosine 
B)  RNA;DNA 
C)  sucrose;lactose 
D)  cellulose;starch 
E)  testosterone;cortisone 
A)  guanine;cytosine 
B)  RNA;DNA 
C)  sucrose;lactose 
D)  cellulose;starch 
E)  testosterone;cortisone

Question 7

Which statement regarding the functional groups of carbon-based molecules is false?

Accepted Answer

A)  They determine how the molecule interacts with other molecules in the environment. 
B)  They repel each other. 
C)  They determine the shape of the molecule. 
D)  They determine the specific properties of the molecule. 
E)  They may have interactions with specific functional groups on the same molecule. 
A)  They determine how the molecule interacts with other molecules in the environment. 
B)  They repel each other. 
C)  They determine the shape of the molecule. 
D)  They determine the specific properties of the molecule. 
E)  They may have interactions with specific functional groups on the same molecule.

Exam 2: The Chemistry and Energy of Life

Which statement about the difference between ionic bonds and covalent bonds is true?

Nitrogen-14 and nitrogen-15 are isotopes,and nitrogen-15 is used to determine protein structure.Based on this information,one can conclude that nitrogen-15 has _______ nitrogen-14.

Phosphorus has an atomic number of 15,and on average phosphorus atoms have a total of 30.974 protons and neutrons.From this information one can conclude that this element

You are given two identical vials of what you are told are identical molecules.However,one vial weighs more than the other,albeit on a very minute scale.One sample weighs more per molecule because the component elements have

All of these molecules are considered to be nonpolar except for

The arrangement of glycosidic linkages in _______ makes it a much more stable molecule than _______.

Which statement regarding the functional groups of carbon-based molecules is false?

Introduction

Nucleic Acids, Proteins, and Enzymes

Cells: the Working Units of Life

Cell Membranes and Signaling

Pathways That Harvest and Store Chemical Energy

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

DNA and Its Role in Heredity

From Dna to Protein: Gene Expression

Regulation of Gene Expression

Genomes

Biotechnology

Genes, Development, and Evolution

Processes of Evolution

Reconstructing and Using Phylogenies

Speciation

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

The Evolution of Plants

The Evolution and Diversity of Fungi

Animal Origins and Diversity

The Plant Body

Plant Nutrition and Transport

Plant Growth and Development

Reproduction of Flowering Plants

Plants in the Environment

Fundamentals of Animal Function

Nutrition and Digestion

Breathing

Circulation

Muscle and Movement

Neurons, Sense Organs, and Nervous Systems

Nervous and Endocrine Control

Water and Salts: Excretion

Animal Reproduction

Animal Development

Immunology: Animal Defense Systems

Animal Behavior

The Distribution of Earths Ecological Systems

Populations

Ecological and Evolutionary Consequences of Interactions Within and Among Species

Ecological Communities

The Global Ecosystem

Filters

The arrangement of glycosidic linkages in _ makes it a much more stable molecule than _.