Question 1

Of the different types of chemical bonds, the strongest bond in biological systems is the _______ bond.

Accepted Answer

The answer of Of the different types of chemical bonds,...

Question 2

Compared to carbon, silicon has the same number of

Accepted Answer

A)  protons. 
B)  valence (outer-shell) electrons. 
C)  neutrons. 
D)  electrons. 
E)  Both a and c 
A)  protons. 
B)  valence (outer-shell) electrons. 
C)  neutrons. 
D)  electrons. 
E)  Both a and c

Question 3

Which of the following molecules is held together primarily by ionic bonds?

Accepted Answer

A)  H2O 
B)  C6H12O6 
C)  NaCl 
D)  H2 
E)  NH3 
A)  H2O 
B)  C6H12O6 
C)  NaCl 
D)  H2 
E)  NH3

Question 4

Which of the following statements about water is true?

Accepted Answer

A)  Water has a low heat of vaporization. 
B)  Water has a high specific heat. 
C)  When water freezes, it gains energy from the environment. 
D)  All of the above 
E)  None of the above 
A)  Water has a low heat of vaporization. 
B)  Water has a high specific heat. 
C)  When water freezes, it gains energy from the environment. 
D)  All of the above 
E)  None of the above

Question 5

Which of the following orbitals is an s orbital?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 6

The amount of heat needed to raise one gram of a substance 1ºC is known as _______.

Accepted Answer

The answer of The amount of heat needed to raise...

Question 7

Particles having a net negative charge are called

Accepted Answer

A)  electronegative. 
B)  cations. 
C)  anions. 
D)  acids. 
E)  bases. 
A)  electronegative. 
B)  cations. 
C)  anions. 
D)  acids. 
E)  bases.

Question 8

When exposed to extreme heat, the human body relies on _______ to absorb excess calories of heat and maintain normal body temperature.

Accepted Answer

A)  evaporation 
B)  condensation 
C)  respiration 
D)  transpiration 
E)  All of the above 
A)  evaporation 
B)  condensation 
C)  respiration 
D)  transpiration 
E)  All of the above

Question 9

The element with which of the following atomic numbers would be most stable?

Accepted Answer

A)  1 
B)  3 
C)  12 
D)  15 
E)  18 
A)  1 
B)  3 
C)  12 
D)  15 
E)  18

Question 10

The stability of the three-dimensional shape of many large molecules is dependent on

Accepted Answer

A)  covalent bonds. 
B)  ionic bonds. 
C)  hydrogen bonds. 
D)  van der Waals attractions. 
E)  hydrophobic interactions. 
A)  covalent bonds. 
B)  ionic bonds. 
C)  hydrogen bonds. 
D)  van der Waals attractions. 
E)  hydrophobic interactions.

Question 11

A single covalent chemical bond represents the sharing of how many electrons?

Accepted Answer

A)  One 
B)  Two 
C)  Three 
D)  Four 
E)  Six 
A)  One 
B)  Two 
C)  Three 
D)  Four 
E)  Six

Question 12

In the equation C6H12O6 $\to$  6CO2 + 6H2O, C6H12O6 is the _______.

Accepted Answer

The answer of In the equation C6H12O6 $\to$  6CO2...

Question 13

An element has a weight of 131.3. The reason the number is not a whole number is that

Accepted Answer

A)  the atomic weight includes the weight of electrons. 
B)  atomic weight is the average of the mass numbers of all the element's isotopes. 
C)  the neutrons do not have a single unit weight. 
D)  the atomic weight does not include the weight of protons. 
E)  the number of electrons may vary. 
A)  the atomic weight includes the weight of electrons. 
B)  atomic weight is the average of the mass numbers of all the element's isotopes. 
C)  the neutrons do not have a single unit weight. 
D)  the atomic weight does not include the weight of protons. 
E)  the number of electrons may vary.

Question 14

Which of the following statements about the isotopes of an element is not true?

Accepted Answer

A)  They all have the same atomic number. 
B)  They all have the same number of protons. 
C)  They all have the same number of neutrons. 
D)  They all have the same number of electrons. 
E)  They all have identical chemical properties. 
A)  They all have the same atomic number. 
B)  They all have the same number of protons. 
C)  They all have the same number of neutrons. 
D)  They all have the same number of electrons. 
E)  They all have identical chemical properties.

Question 15

Hydrogen bonds

Accepted Answer

A)  form between two hydrogen atoms. 
B)  form only between hydrogen and oxygen atoms within a molecule. 
C)  form between a strong electronegative atom and hydrogen. 
D)  involve a transfer of electrons. 
E)  are the strongest bonds because of their length. 
A)  form between two hydrogen atoms. 
B)  form only between hydrogen and oxygen atoms within a molecule. 
C)  form between a strong electronegative atom and hydrogen. 
D)  involve a transfer of electrons. 
E)  are the strongest bonds because of their length.

Question 16

Which characteristic of water contributes to the relatively constant temperatures of the oceans?

Accepted Answer

A)  Water ionizes only slightly. 
B)  It takes a small amount of heat energy to raise the temperature of water. 
C)  Water can contain large amounts of salt. 
D)  Water has the ability to ionize readily. 
E)  It takes a large amount of heat energy to raise the temperature of water. 
A)  Water ionizes only slightly. 
B)  It takes a small amount of heat energy to raise the temperature of water. 
C)  Water can contain large amounts of salt. 
D)  Water has the ability to ionize readily. 
E)  It takes a large amount of heat energy to raise the temperature of water.

Question 17

Nitrogen atoms can form triple bonds with each other. What is a triple bond? How many electrons are shared between two N atoms?

Accepted Answer

Three pairs of elect

Question 18

Because atoms can have the same number of protons but a different number of neutrons, elements have

Accepted Answer

A)  isotopes. 
B)  more than one atomic mass listed on the periodic table. 
C)  more than one atomic number. 
D)  various means of forming chemical bonds. 
E)  isomers. 
A)  isotopes. 
B)  more than one atomic mass listed on the periodic table. 
C)  more than one atomic number. 
D)  various means of forming chemical bonds. 
E)  isomers.

Question 19

The pH of coffee is close to 5 and that of pure water is 7. This means that

Accepted Answer

A)  coffee is more basic than water. 
B)  water is more acidic than coffee. 
C)  the H+ concentration of coffee is seven-fifths that of water. 
D)  the H+ concentration of water is one-one hundredth that of coffee. 
E)  the H+ concentration of water is one-hundred times that of coffee. 
A)  coffee is more basic than water. 
B)  water is more acidic than coffee. 
C)  the H+ concentration of coffee is seven-fifths that of water. 
D)  the H+ concentration of water is one-one hundredth that of coffee. 
E)  the H+ concentration of water is one-hundred times that of coffee.

Question 20

Polar molecules

Accepted Answer

A)  have bonds with an unequal distribution of electric charge. 
B)  must form ions in water solution. 
C)  have bonds with an equal distribution of electrical charge. 
D)  have bonds with an overall negative charge. 
E)  have bonds with an overall positive charge. 
A)  have bonds with an unequal distribution of electric charge. 
B)  must form ions in water solution. 
C)  have bonds with an equal distribution of electrical charge. 
D)  have bonds with an overall negative charge. 
E)  have bonds with an overall positive charge.

Exam 2: Small Molecules and the Chemistry of Life

Of the different types of chemical bonds, the strongest bond in biological systems is the _______ bond.

Compared to carbon, silicon has the same number of

Which of the following molecules is held together primarily by ionic bonds?

Which of the following statements about water is true?

Which of the following orbitals is an s orbital?

The amount of heat needed to raise one gram of a substance 1ºC is known as _______.

Particles having a net negative charge are called

When exposed to extreme heat, the human body relies on _______ to absorb excess calories of heat and maintain normal body temperature.

The element with which of the following atomic numbers would be most stable?

The stability of the three-dimensional shape of many large molecules is dependent on

A single covalent chemical bond represents the sharing of how many electrons?

In the equation C6H12O6 →\to→ 6CO2 + 6H2O, C6H12O6 is the _______.

An element has a weight of 131.3. The reason the number is not a whole number is that

Which of the following statements about the isotopes of an element is not true?

Hydrogen bonds

Which characteristic of water contributes to the relatively constant temperatures of the oceans?

Nitrogen atoms can form triple bonds with each other. What is a triple bond? How many electrons are shared between two N atoms?

Because atoms can have the same number of protons but a different number of neutrons, elements have

The pH of coffee is close to 5 and that of pure water is 7. This means that

Polar molecules

Studying Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

In the equation C₆H₁₂O₆ $\to$ 6CO₂ + 6H₂O, C₆H₁₂O₆ is the _______.