Question 1

A side chain on an amino acid is sometimes called

Accepted Answer

A)  fibrous or globular.
B)  a polypeptide chain.
C)  an R group.
D)  an isozyme.
E)  nucleic acid.F) B) and E)
G) A) and D)

Question 2

The molecule H₂ is known as

Accepted Answer

A)  hydrohydrogen.
B)  hydrogen.
C)  hydroxide.
D)  helium.
E)  semi-water.F) None of the above
G) A) and E)

Question 3

Which of the following substances would be most acidic?

Accepted Answer

A)  lemon juice,pH = 2
B)  urine,pH = 6
C)  tomato juice,pH = 4
D)  white wine,pH = 3
E)  stomach secretions,pH = 1F) All of the above
G) B) and D)

Question 4

Muscle proteins are destroyed after 17 days and then replaced.This is an example of

Accepted Answer

A)  metabolic turnover.
B)  surveillance.
C)  surface tension.
D)  disease.
E)  specificity.F) A) and D)
G) C) and D)

Question 5

The most important metabolic fuel molecule in the body is

Accepted Answer

A)  sucrose.
B)  caffeine.
C)  protein.
D)  vitamins.
E)  glucose.F) None of the above
G) A) and B)

Question 6

The smallest stable units of matter are

Accepted Answer

A)  atoms.
B)  molecules.
C)  protons.
D)  neutrons.
E)  electrons.F) B) and C)
G) A) and C)

Question 7

Which element commonly has only a proton as its nucleus?

Accepted Answer

A)  helium
B)  neon
C)  argon
D)  hydrogen
E)  carbonF) None of the above
G) C) and E)

Question 8

Elements that have atoms with full outer shells of electrons

Accepted Answer

A)  will form many compounds.
B)  will normally form anions.
C)  will normally form cations.
D)  frequently form hydrogen bonds.
E)  are inert gases.F) C) and E)
G) C) and D)

Question 9

By weight,which element is the second most abundant in the human body?

Accepted Answer

A)  oxygen
B)  carbon
C)  hydrogen
D)  nitrogen
E)  calciumF) D) and E)
G) B) and D)

Question 10

The chemical behavior of an atom is determined by the

Accepted Answer

A)  number of protons.
B)  number of neutrons.
C)  outermost electron shell.
D)  size of the atom.
E)  mass of the nucleus.F) B) and E)
G) C) and D)

Question 11

Most of the fat found in the human body is in the form of

Accepted Answer

A)  cholesterol.
B)  phospholipids.
C)  triglycerides.
D)  prostaglandins.
E)  monoglycerides.F) All of the above
G) A) and B)

Question 12

Compounds that can be synthesized or broken down by chemical reactions inside the body are called

Accepted Answer

A)  inorganic compounds.
B)  organic compounds.
C)  nutrients.
D)  metabolites.
E)  enzymes.F) B) and C)
G) D) and E)

Question 13

The weakest bond between two atoms is the ________ bond.

Accepted Answer

A)  ionic
B)  covalent
C)  polar
D)  nonpolar
E)  hydrogenF) A) and D)
G) C) and D)

Question 14

If a substance has a pH that is greater than 7,it is

Accepted Answer

A)  neutral.
B)  acidic.
C)  alkaline.
D)  a buffer.
E)  a salt.F) A) and B)
G) A) and C)

Question 15

An example of an inorganic substance is

Accepted Answer

A)  fructose.
B)  water.
C)  glycerol.
D)  carbon dioxide.
E)  water and carbon dioxide.F) D) and E)
G) C) and D)

Question 16

In a molecule of nitrogen,three pairs of electrons are shared by two nitrogen atoms.The type of bond that is formed is an example of a ________ bond.

Accepted Answer

A)  single trivalent
B)  double divalent
C)  triple covalent
D)  polar covalent
E)  hydrogenF) A) and E)
G) B) and C)

Question 17

One mole of any element has the same

Accepted Answer

A)  mass.
B)  weight.
C)  number of atoms.
D)  number of electrons.
E)  All of the answers are correct.F) A) and B)
G) B) and E)

Question 18

Molecules with two fatty acid chains and a phosphate group that form biological membranes are called

Accepted Answer

A)  diglycerides.
B)  disaccharides.
C)  dipeptides.
D)  prostaglandins.
E)  phospholipids.F) A) and E)
G) A) and D)

Question 19

AB → A + B is to decomposition as A + B → AB is to

Accepted Answer

A)  exchange.
B)  synthesis.
C)  combustion.
D)  replacement.
E)  metabolism.F) A) and C)
G) C) and D)

Question 20

The term ________ refers to certain amino acids,which can have both a positive charge and a negative charge.

Accepted Answer

A)  anion
B)  cation
C)  twinion
D)  zwitterion
E)  double ionF) B) and D)
G) B) and C)

Exam 2: The Chemical Level of Organization

The term ________ refers to certain amino acids,which can have both a positive charge and a negative charge.

Correct AnswerverifiedShow Answer

One mole of any element has the same

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The most important metabolic fuel molecule in the body is

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AB → A + B is to decomposition as A + B → AB is to

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Muscle proteins are destroyed after 17 days and then replaced.This is an example of

Correct AnswerverifiedShow Answer

The smallest stable units of matter are

Correct AnswerverifiedShow Answer

In a molecule of nitrogen,three pairs of electrons are shared by two nitrogen atoms.The type of bond that is formed is an example of a ________ bond.

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Molecules with two fatty acid chains and a phosphate group that form biological membranes are called

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If a substance has a pH that is greater than 7,it is

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The weakest bond between two atoms is the ________ bond.

Correct AnswerverifiedShow Answer

The molecule H₂ is known as

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Elements that have atoms with full outer shells of electrons

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Compounds that can be synthesized or broken down by chemical reactions inside the body are called

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Which of the following substances would be most acidic?

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An example of an inorganic substance is

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The chemical behavior of an atom is determined by the

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A side chain on an amino acid is sometimes called

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Which element commonly has only a proton as its nucleus?

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By weight,which element is the second most abundant in the human body?

Correct AnswerverifiedShow Answer

Most of the fat found in the human body is in the form of

Correct AnswerverifiedShow Answer

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