Question 1

Covalent bonds form when

Accepted Answer

A)  atomic nuclei fuse. 
B)  electrons are shared between two atoms. 
C)  neutrons are transferred from one atom to another. 
D)  molecules become ionized. 
E)  protons are lost from atoms. 
A)  atomic nuclei fuse. 
B)  electrons are shared between two atoms. 
C)  neutrons are transferred from one atom to another. 
D)  molecules become ionized. 
E)  protons are lost from atoms.

Question 2

-The sodium chloride molecule breaks apart in water. What does "B" represent?

Accepted Answer

A)  chloride ion 
B)  dissociation 
C)  water molecule 
D)  sodium ion 
E)  salt crystal 
A)  chloride ion 
B)  dissociation 
C)  water molecule 
D)  sodium ion 
E)  salt crystal

Question 3

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of molecule is found at "E"?

Accepted Answer

A)  water molecule 
B)  polar covalent bond 
C)  hydrogen atom 
D)  oxygen atom 
E)  hydrogen bond 
A)  water molecule 
B)  polar covalent bond 
C)  hydrogen atom 
D)  oxygen atom 
E)  hydrogen bond

Question 4

Lipids

Accepted Answer

A)  serve as buffers. 
B)  are polarized. 
C)  are an important component of cell membranes. 
D)  tend to be water soluble. 
E)  are subunits of carbohydrates. 
A)  serve as buffers. 
B)  are polarized. 
C)  are an important component of cell membranes. 
D)  tend to be water soluble. 
E)  are subunits of carbohydrates.

Question 5

For most chemical reactions, an increase in temperature will cause the reaction rate to

Accepted Answer

A)  remain unchanged. 
B)  increase. 
C)  decrease. 
A)  remain unchanged. 
B)  increase. 
C)  decrease.

Question 6

The molecular formula H2O means

Accepted Answer

A)  1 hydrogen atom and 2 oxygen atoms. 
B)  1 hydrogen atom and 1 oxygen atom. 
C)  2 hydrogen atoms and 1 oxygen atom. 
D)  2 hydrogen atoms and 2 oxygen atoms. 
E)  None of these choices is correct. 
A)  1 hydrogen atom and 2 oxygen atoms. 
B)  1 hydrogen atom and 1 oxygen atom. 
C)  2 hydrogen atoms and 1 oxygen atom. 
D)  2 hydrogen atoms and 2 oxygen atoms. 
E)  None of these choices is correct.

Question 7

Which of the following organic groups does lactose belong to?

Accepted Answer

A)  protein 
B)  nucleic acid 
C)  carbohydrate 
D)  lipid 
E)  vitamin 
A)  protein 
B)  nucleic acid 
C)  carbohydrate 
D)  lipid 
E)  vitamin

Question 8

ATP

Accepted Answer

A)  serves as the energy currency of the cell. 
B)  can store, but cannot release energy in the cell. 
C)  is a sugar found in transfer RNA. 
D)  stores genetic information. 
E)  is a nucleotide found in DNA. 
A)  serves as the energy currency of the cell. 
B)  can store, but cannot release energy in the cell. 
C)  is a sugar found in transfer RNA. 
D)  stores genetic information. 
E)  is a nucleotide found in DNA.

Question 9

The term mass describes the material that makes up all living and nonliving things.

Accepted Answer

A) True 
 B)False

Question 10

The mass number of an atom is the number of

Accepted Answer

A)  electrons plus neutrons in the atom. 
B)  neutrons in the atom. 
C)  neutrons plus protons in the atom. 
D)  protons in the atom. 
E)  protons plus electrons in the atom. 
A)  electrons plus neutrons in the atom. 
B)  neutrons in the atom. 
C)  neutrons plus protons in the atom. 
D)  protons in the atom. 
E)  protons plus electrons in the atom.

Question 11

Which of the following pairs is mismatched?

Accepted Answer

A)  hydrolysis - water is used in decomposition reaction 
B)  synthesis reaction - two reactants combine to form a larger product 
C)  decomposition reaction - large reactant broken into smaller products 
D)  dehydration reaction - water is a product of the reaction 
E)  oxidation - gain of electrons 
A)  hydrolysis - water is used in decomposition reaction 
B)  synthesis reaction - two reactants combine to form a larger product 
C)  decomposition reaction - large reactant broken into smaller products 
D)  dehydration reaction - water is a product of the reaction 
E)  oxidation - gain of electrons

Question 12

The amount of matter in an object is its

Accepted Answer

A)  element. 
B)  mass. 
C)  ionic charge. 
D)  atomic number. 
E)  weight. 
A)  element. 
B)  mass. 
C)  ionic charge. 
D)  atomic number. 
E)  weight.

Question 13

Arrange the following from largest to smallest: (1) nucleus
(2) DNA molecule
(3) skin cell
(4) chicken eggs

Accepted Answer

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

Question 14

Eicosanoids

Accepted Answer

A)  are structural proteins. 
B)  comprise the genetic material. 
C)  are components of the plasma membrane. 
D)  play a role in the response of tissues to injuries. 
E)  are fat-soluble vitamins. 
A)  are structural proteins. 
B)  comprise the genetic material. 
C)  are components of the plasma membrane. 
D)  play a role in the response of tissues to injuries. 
E)  are fat-soluble vitamins.

Question 15

Intermolecular forces are weak electrostatic attractions that exist between

Accepted Answer

A)  two atoms 
B)  two molecules 
C)  two protons 
A)  two atoms 
B)  two molecules 
C)  two protons

Question 16

Normal pH for blood is 7.35 to 7.45. Maintenance of the pH in this range is

Accepted Answer

A)  critical because enzymes work best within narrow ranges of pH. 
B)  not critical because extreme pH values do not affect enzyme function. 
C)  called denaturation. 
D)  not required. 
E)  None of these choices is correct. 
A)  critical because enzymes work best within narrow ranges of pH. 
B)  not critical because extreme pH values do not affect enzyme function. 
C)  called denaturation. 
D)  not required. 
E)  None of these choices is correct.

Question 17

Lipids

Accepted Answer

A)  function as enzymes. 
B)  yield little energy per unit of weight. 
C)  comprise the genetic material of cells. 
D)  are all water soluble. 
E)  can insulate and help prevent heat loss. 
A)  function as enzymes. 
B)  yield little energy per unit of weight. 
C)  comprise the genetic material of cells. 
D)  are all water soluble. 
E)  can insulate and help prevent heat loss.

Question 18

Potential energy is

Accepted Answer

A)  stored energy that could do work but is not doing so. 
B)  movement of ions or electrons. 
C)  the form of energy that actually does work. 
D)  energy that flows between objects with different temperatures. 
E)  energy that moves in waves. 
A)  stored energy that could do work but is not doing so. 
B)  movement of ions or electrons. 
C)  the form of energy that actually does work. 
D)  energy that flows between objects with different temperatures. 
E)  energy that moves in waves.

Question 19

An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

Accepted Answer

A)  an amino acid. 
B)  a triglyceride (fat). 
C)  carbon dioxide. 
D)  a phospholipid. 
E)  a monosaccharide. 
A)  an amino acid. 
B)  a triglyceride (fat). 
C)  carbon dioxide. 
D)  a phospholipid. 
E)  a monosaccharide.

Question 20

Kinetic energy is

Accepted Answer

A)  movement of ions or electrons. 
B)  energy that moves in waves. 
C)  energy that flows between objects with different temperatures. 
D)  the form of energy that actually does work. 
E)  stored energy that could do work but is not doing so. 
A)  movement of ions or electrons. 
B)  energy that moves in waves. 
C)  energy that flows between objects with different temperatures. 
D)  the form of energy that actually does work. 
E)  stored energy that could do work but is not doing so.

Exam 2: The Chemical Basis of Life

Covalent bonds form when

-The sodium chloride molecule breaks apart in water. What does "B" represent?

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of molecule is found at "E"?

Lipids

For most chemical reactions, an increase in temperature will cause the reaction rate to

The molecular formula H2O means

Which of the following organic groups does lactose belong to?

ATP

The term mass describes the material that makes up all living and nonliving things.

The mass number of an atom is the number of

Which of the following pairs is mismatched?

The amount of matter in an object is its

Arrange the following from largest to smallest: (1) nucleus (2) DNA molecule (3) skin cell (4) chicken eggs

Eicosanoids

Intermolecular forces are weak electrostatic attractions that exist between

Normal pH for blood is 7.35 to 7.45. Maintenance of the pH in this range is

Lipids

Potential energy is

An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably

Kinetic energy is

The Human Organism

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Temperature Regulation

Urinary System

Water, Electrolyte, and Acid-Based Balance

Reproductive System

Development, Growth, Aging, and Genetics

Filters

The molecular formula H₂O means