Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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) D) and E)
G) A) and E)

Question 3

Which of the following organic groups does lactose belong to?

Accepted Answer

A)   protein
B)   nucleic acid
C)   carbohydrate
D)   lipid
E)   vitaminF) A) and E)
G) None of the above

Question 4

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

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.D) None of the above
E) All of the above

Question 6

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 D)
G) B) and C)

Question 7

-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 crystalF) A) and B)
G) C) and D)

Question 8

Intermolecular forces are weak electrostatic attractions that exist between

Accepted Answer

A)   two atoms
B)   two molecules
C)   two protonsD) All of the above
E) B) and C)

Question 9

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

Question 10

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) A) and D)
G) A) and C)

Question 11

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

Question 12

-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 bondF) None of the above
G) A) and D)

Question 13

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

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

Question 15

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

Question 16

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

Question 17

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

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

Question 19

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 electronsF) A) and B)
G) A) and E)

Question 20

The amount of matter in an object is its

Accepted Answer

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

Exam 2: The Chemical Basis of Life

ATP

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Intermolecular forces are weak electrostatic attractions that exist between

Correct AnswerverifiedShow Answer

-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"?

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

Correct AnswerverifiedShow Answer

Which of the following organic groups does lactose belong to?

Correct AnswerverifiedShow Answer

The molecular formula H2O means

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The mass number of an atom is the number of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following pairs is mismatched?

Correct AnswerverifiedShow Answer

The amount of matter in an object is its

Correct AnswerverifiedShow Answer

Kinetic energy is

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Potential energy is

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Eicosanoids

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Lipids

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Covalent bonds form when

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Lipids

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The molecular formula H₂O means

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