Question 1

Which of the following organic groups does an enzyme belong to?

Accepted Answer

A)   nucleic acid
B)   lipid
C)   vitamin
D)   carbohydrate
E)   proteinF) B) and C)
G) A) and D)

Question 2

Glucose is the

Accepted Answer

A)   sugar found in RNA.
B)   nondigestible plant polysaccharide.
C)   storage carbohydrate in animals.
D)   storage carbohydrate in plants.
E)   major nutrient for most body cells.F) A) and D)
G) A) and C)

Question 3

All of the following terms relate to lipids. Which does not belong with the other four?

Accepted Answer

A)   steroid
B)   cholesterol
C)   estrogen
D)   bile salts
E)   triglycerideF) A) and D)
G) B) and C)

Question 4

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) B) and D)
G) A) and D)

Question 5

Molecules that form when electrons are shared unequally between atoms are called

Accepted Answer

A)   salt molecules.
B)   polar molecules.
C)   nonpolar molecules.
D)   lopsided molecules.
E)   None of these choices are correct.F) B) and D)
G) A) and B)

Question 6

The minimum energy required to start a chemical reaction

Accepted Answer

A)   can be lowered by enzymes.
B)   is elevated by a catalyst.
C)   moves in energy surges.
D)   comes from ionic energy motion.
E)   results from random molecular movement.F) A) and D)
G) A) and E)

Question 7

Sodium chloride is considered a(n)

Accepted Answer

A)   molecule.
B)   element.
C)   compound.
D)   molecule and a compound.
E)   ion.F) C) and E)
G) B) and C)

Question 8

Which of the following is a source of nitrogen for the body?

Accepted Answer

A)   proteins
B)   water
C)   carbohydrates
D)   lipids
E)   glucoseF) A) and B)
G) C) and E)

Question 9

The four most abundant elements in the human body are

Accepted Answer

A)   calcium, hydrogen, sodium, and potassium.
B)   carbon, oxygen, magnesium, and zinc.
C)   carbon, hydrogen, oxygen, and iron.
D)   carbon, hydrogen, oxygen, and nitrogen.
E)   carbon, sulfur, calcium, and potassium.F) A) and B)
G) C) and D)

Question 10

Starch is the

Accepted Answer

A)   storage carbohydrate in animals.
B)   sugar found in RNA.
C)   major nutrient for most body cells.
D)   nondigestible plant polysaccharide.
E)   storage carbohydrate in plants.F) None of the above
G) C) and D)

Question 11

The minimum amount of energy that reactants must have to start a chemical reaction is called

Accepted Answer

A)   potential energy.
B)   mechanical energy.
C)   kinetic energy.
D)   activation energy.
E)   electromagnetic energy.F) A) and B)
G) A) and C)

Question 12

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) C) and D)

Question 13

The conversion between different states of energy (e.g. potential energy to kinetic energy) :

Accepted Answer

A)   is not 100% efficent
B)   is 100% efficent
C)   typically generates heat
D)   is not possible, energy can not change its state.
E)   is not 100% efficient and typically generates heatF) C) and E)
G) C) and D)

Question 14

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

Question 15

In an x-ray film of the skeletal system, the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

Accepted Answer

A)   light, absorb; dark, do not absorb
B)   dark, absorb; light, do not absorb
C)   dark, do not absorb; light, do absorb
D)   light, do not absorb; dark, aborbE) B) and C)
F) A) and D)

Question 16

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

Accepted Answer

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

Question 17

Which function of proteins is NOT correctly matched with the example?

Accepted Answer

A)   structure - collagen and keratin
B)   regulation - enzymes and hormones
C)   transport - hemoglobin
D)   contraction - actin and myosin in muscles
E)   protection - packing around organs and glandsF) B) and E)
G) C) and D)

Question 18

Cellulose is the

Accepted Answer

A)   storage carbohydrate in animals.
B)   nondigestible plant polysaccharide.
C)   major nutrient for most body cells.
D)   sugar found in RNA.
E)   storage carbohydrate in plants.F) A) and E)
G) C) and D)

Question 19

Which of the following statements is false?

Accepted Answer

A)   Water transports nutrients in the body.
B)   Water evaporation heats the body.
C)   Water evaporation cools the body.
D)   Water serves as an effective lubricant in our bodies.
E)   Water allows the body to resist sudden temperature changes.F) All of the above
G) A) and B)

Question 20

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) B) and C)
G) B) and E)

Exam 2: The Chemical Basis of Life

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

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All of the following terms relate to lipids. Which does not belong with the other four?

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Which of the following organic groups does an enzyme belong to?

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Starch is the

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Isotopes of the same element have

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Molecules that form when electrons are shared unequally between atoms are called

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Cellulose is the

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

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

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Which of the following statements is false?

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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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The four most abundant elements in the human body are

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Which function of proteins is NOT correctly matched with the example?

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Glucose is the

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The conversion between different states of energy (e.g. potential energy to kinetic energy) :

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Which of the following is a source of nitrogen for the body?

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The minimum energy required to start a chemical reaction

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In an x-ray film of the skeletal system, the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

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The minimum amount of energy that reactants must have to start a chemical reaction is called

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Sodium chloride is considered a(n)

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In an x-ray film of the skeletal system, the dense tissue areas appear because they the x-rays; and the less dense tissues appear because they the x-rays.

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