Question 1

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)  energyF) C) and D)
G) A) and B)

Question 2

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)   sodiumD) A) and B)
E) All of the above

Question 3

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.F) All of the above
G) B) and E)

Question 4

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.F) B) and E)
G) C) and E)

Question 5

-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 crystalF) None of the above
G) B) and D)

Question 6

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

Accepted Answer

A)   water
B)   glucose
C)   oxygen
D)   calciumE) A) and D)
F) None of the above

Question 7

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.F) A) and D)
G) C) and E)

Question 8

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.F) B) and C)
G) A) and E)

Question 9

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 togetherE) A) and C)
F) B) and C)

Question 10

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

Accepted Answer

A)  remain unchanged.
B)  increase.
C)  decrease.D) A) and C)
E) All of the above

Question 11

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 structureF) A) and C)
G) B) and C)

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.F) A) and C)
G) C) and D)

Question 13

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.F) A) and B)
G) C) and D)

Question 14

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.F) A) and B)
G) A) and D)

Question 15

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.F) A) and B)
G) A) and C)

Question 16

Intermolecular forces are weak electrostatic attractions that exist between

Accepted Answer

A)   two atoms
B)   two molecules
C)   two protonsD) None of the above
E) All of the above

Question 17

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 proteinF) C) and D)
G) B) and D)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

-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) regionF) B) and D)
G) B) and E)

Question 20

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)  2,3,1,4F) A) and E)
G) C) and D)

Exam 2: The Chemical Basis of Life

When ionic compounds dissolve in water,their ions

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

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

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

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Nucleotides

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Hydrogen bonds are important for all of the following except:

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

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

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Lipids

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

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Intermolecular forces are weak electrostatic attractions that exist between

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

Correct AnswerverifiedShow Answer

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

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

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

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

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

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A molecule is

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

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

Correct AnswerverifiedShow Answer

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