Question 1

Which of the following would be classified as a lipid?

Accepted Answer

A)   cholesterol-a steroid
B)   alanine-an amino acid
C)   starch-a polysaccharide
D)   catalase-an enzyme
E)   sucrose-a disaccharideF) B) and C)
G) A) and E)

Question 2

Chemical substances that dissolve in water or react with water to release ions are known as

Accepted Answer

A)   buffers.
B)   enzymes.
C)   bases.
D)   inorganic compounds.
E)   electrolytes.F) C) and D)
G) C) and E)

Question 3

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)   They may need a cofactor to be functional.
D)   The active site has a specific shape to match the reactant(s) .
E)   A slight change in shape can effect function.F) B) and C)
G) All of the above

Question 4

Nucleotides

Accepted Answer

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

Question 5

What particle is formed when an acid loses a proton (H+) ?

Accepted Answer

A)   buffer
B)   conjugate acid
C)   salt
D)   conjugate baseE) All of the above
F) A) and B) D

Question 6

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

Accepted Answer

A)   chloride ion
B)   dissociation
C)   water molecule
D)   sodium ion
E)   salt crystalF) B) and E)
G) C) and D)

Question 7

A base is a proton

Accepted Answer

A)   donor.
B)   converter.
C)   acceptor.
D)   creator.
E)   Both acceptor and creator.F) A) and C)
G) A) and B)

Question 8

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) A) and D)

Question 9

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

Accepted Answer

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

Question 10

A buffer will

Accepted Answer

A)   enhance changes in the pH of the solutions.
B)   resist drastic changes in the pH of the solutions.
C)   have no effect on the pH of the solutions.
D)   make a solution more acidic.
E)   make a solution more basic.F) C) and E)
G) A) and C)

Question 11

Polysaccharides

Accepted Answer

A)   are formed when sucrose and glucose combine.
B)   are the smallest carbohydrates.
C)   contain carbon, hydrogen, and phosphate atoms.
D)   contain long chains of monosaccharides.
E)   are not found in plants.F) B) and D)
G) A) and C)

Question 12

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

Accepted Answer

A)   phosphorus
B)   oxygen
C)   nitrogen
D)   polar (hydrophilic)  region
E)   nonpolar (hydrophobic)  regionF) A) and C)
G) All of the above

Question 13

Reactions that use water to split molecules apart are called _______ reactions.

Accepted Answer

A)   dehydration
B)   synthesis
C)   hydrolysis
D)   reversible
E)   oxidationF) A) and B)
G) None of the above

Question 14

The number of atoms in exactly 12 grams of carbon-12 is called

Accepted Answer

A)   Dalton's number.
B)   Socrates's number.
C)   Avogadro's number.
D)   Pasteur's number.
E)   Le Chatelier's number.F) B) and E)
G) B) and C)

Question 15

DNA

Accepted Answer

A)   must travel to ribosomes to function.
B)   contains the sugar deoxyribose.
C)   is a single-stranded molecule.
D)   is one of several amino acids.
E)   assembles amino acids to make proteins..F) C) and D)
G) A) and B)

Question 16

ATP

Accepted Answer

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

Question 17

Potential energy is

Accepted Answer

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

Question 18

Which of the following statements is false?

Accepted Answer

A)   Water allows the body to resist sudden temperature changes.
B)   Water transports nutrients in the body.
C)   Water serves as an effective lubricant in our bodies.
D)   Water evaporation cools the body.
E)   Water evaporation heats the body.F) None of the above
G) C) and E)

Question 19

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)   Fatty acid B is unsaturated.
C)   Both fatty acids are saturated.
D)   Both fatty acids are unsaturated.
E)   Fatty acid B is saturated.F) A) and B)
G) A) and C)

Question 20

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

Accepted Answer

A)   increase.
B)   decrease.
C)   remain unchanged.D) A) and C)
E) B) and C) A

Exam 2: The Chemical Basis of Life

Which of the following would be classified as a lipid?

Correct AnswerverifiedShow Answer

Chemical substances that dissolve in water or react with water to release ions are known as

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Which of the following is NOT true of enzymes?

Correct AnswerverifiedShow Answer

Nucleotides

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What particle is formed when an acid loses a proton (H+) ?

Correct AnswerverifiedD

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

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A base is a proton

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

A buffer will

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Polysaccharides

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

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Reactions that use water to split molecules apart are called _______ reactions.

Correct AnswerverifiedShow Answer

The number of atoms in exactly 12 grams of carbon-12 is called

Correct AnswerverifiedShow Answer

DNA

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ATP

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Potential energy is

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Which of the following statements is false?

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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

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

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D

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B

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A