Question 1

Hydrogen bonds are important for all of the following except:

Accepted Answer

A)  producing surface tension in water 
B)  helping hold DNA strands together 
C)  helping atoms give up or receive electrons 
D)  helping hold a protein structure together 
A)  producing surface tension in water 
B)  helping hold DNA strands together 
C)  helping atoms give up or receive electrons 
D)  helping hold a protein structure together

Question 2

When ionic compounds dissolve in water,their ions

Accepted Answer

A) dissociate or separate from one another. 
B) get lost in the solvent. 
C) cling tightly together. 
D) lose their charge. 
E) settle to the bottom of the container. 
A) dissociate or separate from one another. 
B) get lost in the solvent. 
C) cling tightly together. 
D) lose their charge. 
E) settle to the bottom of the container.

Question 3

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 4

-Phospholipids are important components of the plasma membrane.What does "C" represent on the diagram?

Accepted Answer

A) phosphorus 
B) oxygen 
C) nitrogen 
D) polar (hydrophilic)region 
E) nonpolar (hydrophobic)region 
A) phosphorus 
B) oxygen 
C) nitrogen 
D) polar (hydrophilic)region 
E) nonpolar (hydrophobic)region

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

A molecule is

Accepted Answer

A) a substance that conducts electricity when placed in solution. 
B) a positively charged ion. 
C) an alteration in the three-dimensional structure of a protein. 
D) a combination of atoms held together by chemical bonds. 
E) a negatively charged ion. 
A) a substance that conducts electricity when placed in solution. 
B) a positively charged ion. 
C) an alteration in the three-dimensional structure of a protein. 
D) a combination of atoms held together by chemical bonds. 
E) a negatively charged ion.

Question 7

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 8

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 9

Hyperventilation causes the loss of large amounts of carbon dioxide from the body,decreasing the amount of hydrogen ions in solution.As a result,

Accepted Answer

A) the pH of body fluids will rise. 
B) the pH of body fluids will fall. 
C) the pH of body fluids will become neutral. 
D) the pH of body fluids will not be affected. 
E) None of these choices is correct. 
A) the pH of body fluids will rise. 
B) the pH of body fluids will fall. 
C) the pH of body fluids will become neutral. 
D) the pH of body fluids will not be affected. 
E) None of these choices is correct.

Question 10

Which of the following is NOT a function of carbohydrates in the body?

Accepted Answer

A) structural component of RNA 
B) bulk in feces 
C) structural component of DNA 
D) protection 
E) energy 
A) structural component of RNA 
B) bulk in feces 
C) structural component of DNA 
D) protection 
E) energy

Question 11

From the following list,select the one organic substance found in the human body.

Accepted Answer

A)  water 
B)  glucose 
C)  oxygen 
D)  calcium 
A)  water 
B)  glucose 
C)  oxygen 
D)  calcium

Question 12

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 13

In order to get energy (ATP)from food molecules in the final stage of respiration,humans require _____.

Accepted Answer

A)  carbon dioxide 
B)  oxygen 
C)  sodium 
A)  carbon dioxide 
B)  oxygen 
C)  sodium

Question 14

In a reversible reaction,when the rate of product formation is equal to the rate of reactant formation,the reaction is

Accepted Answer

A) in danger of exploding. 
B) a net decomposition reaction. 
C) a net synthesis reaction. 
D) stopped. 
E) at equilibrium. 
A) in danger of exploding. 
B) a net decomposition reaction. 
C) a net synthesis reaction. 
D) stopped. 
E) at equilibrium.

Question 15

-The sodium chloride molecule breaks apart in water.What does "C" 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 16

Nucleotides

Accepted Answer

A) hold the nucleus together. 
B) are proteins that function as enzymes. 
C) have nothing to do with the genetic information in the nucleus. 
D) are the building blocks of nucleic acids. 
E) are part of DNA molecules but not RNA molecules. 
A) hold the nucleus together. 
B) are proteins that function as enzymes. 
C) have nothing to do with the genetic information in the nucleus. 
D) are the building blocks of nucleic acids. 
E) are part of DNA molecules but not RNA molecules.

Question 17

What protein structure results from folding or coiling of a polypeptide chain caused by hydrogen bonds between amino acids?

Accepted Answer

A) secondary structure 
B) tertiary structure 
C) quaternary structure 
D) primary structure 
E) peptide structure 
A) secondary structure 
B) tertiary structure 
C) quaternary structure 
D) primary structure 
E) peptide structure

Question 18

The hydrogen and oxygen atoms in a molecule of water are held together by

Accepted Answer

A) peptide bonds. 
B) ionic bonds. 
C) nonpolar bonds. 
D) savings bonds. 
E) polar covalent bonds. 
A) peptide bonds. 
B) ionic bonds. 
C) nonpolar bonds. 
D) savings bonds. 
E) polar covalent bonds.

Question 19

Which of the following means a change in shape of a protein?

Accepted Answer

A) primary structure of protein 
B) peptide bond 
C) denaturation 
D) amino acid 
E) secondary structure of protein 
A) primary structure of protein 
B) peptide bond 
C) denaturation 
D) amino acid 
E) secondary structure of protein

Question 20

True or false? The term mass describes the material that makes up all living and nonliving things.

Accepted Answer

A) True 
 B)False

Exam 2: The Chemical Basis of Life

Hydrogen bonds are important for all of the following except:

When ionic compounds dissolve in water,their ions

Intermolecular forces are weak electrostatic attractions that exist between

-Phospholipids are important components of the plasma membrane.What does "C" represent on the diagram?

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

A molecule is

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

Lipids

Hyperventilation causes the loss of large amounts of carbon dioxide from the body,decreasing the amount of hydrogen ions in solution.As a result,

Which of the following is NOT a function of carbohydrates in the body?

From the following list,select the one organic substance found in the human body.

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

In order to get energy (ATP)from food molecules in the final stage of respiration,humans require _____.

In a reversible reaction,when the rate of product formation is equal to the rate of reactant formation,the reaction is

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

Nucleotides

What protein structure results from folding or coiling of a polypeptide chain caused by hydrogen bonds between amino acids?

The hydrogen and oxygen atoms in a molecule of water are held together by

Which of the following means a change in shape of a protein?

True or false? The term mass describes the material that makes up all living and nonliving things.

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

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