Question 1

Isotopes of the same element have

Accepted Answer

A)  no mass number.
B)  the same mass number.
C)  the same number of neutrons but different numbers of protons.
D)  different numbers of protons and electrons.
E)  the same atomic number but differ in their mass numbers.F) A) and D)
G) A) and C)

Question 2

A group of water molecules are held together by

Accepted Answer

A)  salt.
B)  double covalent bonds.
C)  polar covalent bonds.
D)  ionic bonds.
E)  hydrogen bonds.F) A) and D)
G) C) and E)

Question 3

A substance that will increase the rate of a chemical reaction without being permanently changed is called a/an

Accepted Answer

A)  oxidator.
B)  reducing agent.
C)  catalyst.
D)  solute.E) A) and C)
F) B) and C) C

Question 4

Fatty acid A has 10 double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain.

Accepted Answer

A)  Fatty acid A is saturated.
B)  Both fatty acids are saturated.
C)  Both fatty acids are unsaturated.
D)  Fatty acid B is saturated.
E)  Fatty acid B is unsaturated.F) None of the above
G) A) and C)

Question 5

Electrons

Accepted Answer

A)  are the subatomic particles most involved in bonding behavior of atoms.
B)  have a positive charge of one.
C)  comprise the majority of the mass of an atom.
D)  do not participate in the bonding of atoms.
E)  are located in the nucleus of an atom.F) B) and E)
G) C) and D)

Question 6

Triglycerides are composed of

Accepted Answer

A)  monosaccharides.
B)  amino acids.
C)  nucleotides.
D)  glycerol and fatty acids.
E)  None of these choices are correct.F) A) and E)
G) B) and C)

Question 7

An individual hydrogen bond in a sample of water would be described as:

Accepted Answer

A)  strong and intramolecular.
B)  weak and intramolecular.
C)  weak and intermolecular.
D)  strong and intermolecular.E) B) and C)
F) A) and D)

Question 8

Which of the following is mismatched?

Accepted Answer

A)  triglyceride--fat
B)  eicosanoid--prostaglandin
C)  ribose--RNA
D)  enzyme--protein
E)  cholesterol--nucleic acidF) B) and C)
G) A) and E)

Question 9

Why is water involved in most metabolic reactions in the human body?

Accepted Answer

A)  It has a high surface tension.
B)  It is a solute.
C)  Its bonds are nonpolar.
D)  It can dissolve many chemical compounds.
E)  It can absorb and release heat without changing temperature very much.F) C) and D)
G) None of the above

Question 10

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

Accepted Answer

A)  phosphorus
B)  oxygen
C)  nitrogen
D)  polar (hydrophilic) region
E)  nonpolar (hydrophobic) regionF) None of the above
G) A) and B)

Question 11

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

Question 12

An organic molecule such as a vitamin that makes an enzyme functional is called a/an

Accepted Answer

A)  coenzyme.
B)  buffer.
C)  catalyst.
D)  coactivator.E) None of the above
F) All of the above A

Question 13

The presence of water in our bodies allows us to

Accepted Answer

A)  cool the body with sweat.
B)  maintain a fairly constant body temperature.
C)  provide an environment for chemical reactions.
D)  keep tissues moist and reduce friction.
E)  All of these choices are correct.F) A) and D)
G) A) and E) E

Question 14

Which of the following nitrogen bases is found in RNA but not DNA?

Accepted Answer

A)  cytosine
B)  adenine
C)  thymine
D)  uracil
E)  guanineF) All of the above
G) A) and C)

Question 15

When the hydrogen bonds that maintain a protein's three-dimensional shape are broken,the protein becomes nonfunctional,and is said to be

Accepted Answer

A)  unsaturated.
B)  essential.
C)  saturated.
D)  denatured.
E)  structural.F) D) and E)
G) C) and E)

Question 16

Which of the following is NOT true of enzymes?

Accepted Answer

A)  They are catalysts that increase the rate of a reaction.
B)  One enzyme can have many reactions.
C)  The active site has a specific shape to match the reactant(s) .
D)  A slight change in shape can effect function.
E)  They may need a cofactor to be functional.F) A) and D)
G) C) and D)

Question 17

The smallest particle of an element that still exhibits the chemical characteristics of that element is a(n)

Accepted Answer

A)  proton.
B)  atom.
C)  orbital.
D)  chemical bond.
E)  electron.F) B) and E)
G) A) and E)

Question 18

An anion is

Accepted Answer

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

Question 19

Which of the following chemical reactions best represents the synthesis of ATP?

Accepted Answer

A)  ATP + H2O  →\rightarrow→  ADP + Pi + energy
B)  ATP + energy  →\rightarrow→  ADP + H2O
C)  ADP + Pi + energy  →\rightarrow→  ATP + H2O
D)  ATP + ADP  →\rightarrow→  ATP
E)  ADP + ADP + ADP  →\rightarrow→ ATP + energy F) A) and D)
G) None of the above

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) A) and C)

Exam 2: The Chemical Basis of Life

Isotopes of the same element have

Correct AnswerverifiedShow Answer

A group of water molecules are held together by

Correct AnswerverifiedShow Answer

A substance that will increase the rate of a chemical reaction without being permanently changed is called a/an

Correct AnswerverifiedC

Fatty acid A has 10 double covalent bonds scattered throughout its carbon chain while fatty acid B has only single covalent bonds between the carbons in its chain.

Correct AnswerverifiedShow Answer

Electrons

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Triglycerides are composed of

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An individual hydrogen bond in a sample of water would be described as:

Correct AnswerverifiedShow Answer

Which of the following is mismatched?

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Why is water involved in most metabolic reactions in the human body?

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

Correct AnswerverifiedShow Answer

Lipids

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An organic molecule such as a vitamin that makes an enzyme functional is called a/an

Correct AnswerverifiedA

The presence of water in our bodies allows us to

Correct AnswerverifiedE

Which of the following nitrogen bases is found in RNA but not DNA?

Correct AnswerverifiedShow Answer

When the hydrogen bonds that maintain a protein's three-dimensional shape are broken,the protein becomes nonfunctional,and is said to be

Correct AnswerverifiedShow Answer

Which of the following is NOT true of enzymes?

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The smallest particle of an element that still exhibits the chemical characteristics of that element is a(n)

Correct AnswerverifiedShow Answer

An anion is

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Which of the following chemical reactions best represents the synthesis of ATP?

Correct AnswerverifiedShow Answer

The amount of matter in an object is its

Correct AnswerverifiedShow Answer

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C

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A

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E

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