Question 1

Polar molecules:

Accepted Answer

A) have an overall negative electric charge. 
B) have an equal distribution of electric charge. 
C) have an overall positive electric charge. 
D) have an unequal distribution of electric charge. 
E) are always ions. 
A) have an overall negative electric charge. 
B) have an equal distribution of electric charge. 
C) have an overall positive electric charge. 
D) have an unequal distribution of electric charge. 
E) are always ions.

Question 2

Imagine you are trying to make a homemade salad dressing and place several drops of olive oil into a container of water. You stir the solution, but the oil doesn't readily mix. Instead, you observe a glistening clump of oil floating on the surface. Explain what is happening at the molecular level. (Your answer should include the term "hydrophobic.")

Accepted Answer

When oil molecules are together in water

Question 3

Water surface tension is a result of the adhesive nature of water molecules. True or False?

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is least affected by the presence of water?

Accepted Answer

A) nonpolar covalent bond 
B) polar covalent bond 
C) ionic bond 
D) hydrogen bond 
E) electronproton interaction 
A) nonpolar covalent bond 
B) polar covalent bond 
C) ionic bond 
D) hydrogen bond 
E) electronproton interaction

Question 5

If a certain atom has a tendency to lose two electrons, this lends itself to the formation of a(n):

Accepted Answer

A) polar molecule. 
B) ion. 
C) water molecule. 
D) isotope. 
A) polar molecule. 
B) ion. 
C) water molecule. 
D) isotope.

Question 6

The part of the atom that has the greatest biological interest and influence is the:

Accepted Answer

A) proton. 
B) electron. 
C) neutron. 
D) innermost electron shell. 
A) proton. 
B) electron. 
C) neutron. 
D) innermost electron shell.

Question 7

Milk of magnesia is often used to treat stomach upset. It has a pH of 10. Based on this information, milk of magnesia:

Accepted Answer

A) is a base. 
B) is hydrophobic. 
C) is an acid. 
D) has the same pH as stomach acid. 
A) is a base. 
B) is hydrophobic. 
C) is an acid. 
D) has the same pH as stomach acid.

Question 8

Water moves through a plant because of the property of:

Accepted Answer

A) high heat of fusion. 
B) high heat of vaporization. 
C) high specific heat. 
D) cohesion. 
A) high heat of fusion. 
B) high heat of vaporization. 
C) high specific heat. 
D) cohesion.

Question 9

Why is a helium atom (atomic number 2)more stable than a hydrogen atom (atomic number 1)?

Accepted Answer

Two electrons completely fill

Question 10

Atoms or molecules that have gained or lost electrons are called:

Accepted Answer

A) acids. 
B) bases. 
C) polymers. 
D) ions. 
E) buffers. 
A) acids. 
B) bases. 
C) polymers. 
D) ions. 
E) buffers.

Exam 2: Atoms, Molecules, and Life

Polar molecules:

Water surface tension is a result of the adhesive nature of water molecules. True or False?

Which of the following is least affected by the presence of water?

If a certain atom has a tendency to lose two electrons, this lends itself to the formation of a(n):

The part of the atom that has the greatest biological interest and influence is the:

Milk of magnesia is often used to treat stomach upset. It has a pH of 10. Based on this information, milk of magnesia:

Water moves through a plant because of the property of:

Why is a helium atom (atomic number 2)more stable than a hydrogen atom (atomic number 1)?

Atoms or molecules that have gained or lost electrons are called:

An Introduction to Life on Earth

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

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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