Question 1

Subatomic particles located around the nucleus of an atom are

Accepted Answer

A)  electrons.
B)  neutrons.
C)  photons.
D)  protons.
E)  neutrinos.F) B) and E)
G) A) and E)

Question 2

Hydrogen bonds form between molecules containing _________ bonds; the hydrogen bond is between a hydrogen atom of one molecule and a partially _________ charged atom of another.

Accepted Answer

A)  polar covalent; negatively
B)  nonpolar covalent; negatively
C)  nonpolar covalent; positively
D)  polar covalent; positively
E)  ionic; positivelyF) B) and D)
G) A) and B)

Question 3

Which of the following is determined by sequence of amino acids bound by peptide bonds?

Accepted Answer

A)  primary structure of protein
B)  secondary structure of protein
C)  amino acid
D)  denaturation
E)  peptide bondF) A) and B)
G) A) and E)

Question 4

Inorganic chemists study substances _______ carbon,while organic chemists study substances _______ carbon.

Accepted Answer

A)   lacking; containing
B)   containing more than 1 mole of; with less than a mole of
C)   containing; lackingD) None of the above
E) A) and C)

Question 5

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) D) and E)
G) B) and E)

Question 6

Enzymes are proteins that increase the rate of chemical reactions by

Accepted Answer

A)  increasing the activation energy of the reaction.
B)  increasing the concentration of the reactants.
C)  decreasing the activation energy of the reaction.
D)  adjusting the temperature of the reaction.E) A) and B)
F) A) and D)

Question 7

An electrolyte is

Accepted Answer

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

Question 8

Which of the following organic groups does hemoglobin belong to?

Accepted Answer

A)  nucleic acid
B)  vitamin
C)  lipid
D)  protein
E)  carbohydrateF) B) and C)
G) A) and E)

Question 9

Which of the following is a proton donor?

Accepted Answer

A)  a salt
B)  a base
C)  a neutral substance
D)  an acid
E)  glucoseF) None of the above
G) C) and D)

Question 10

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 B)
G) C) and E)

Question 11

In an oxidation-reduction reaction,______ are transferred between molecules

Accepted Answer

A)   oxygen
B)   electronsC) A) and B)
D) undefined

Question 12

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

Accepted Answer

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

Question 13

Large carbohydrates are formed from smaller units called

Accepted Answer

A)  lipids.
B)  phosphate groups.
C)  amino acids.
D)  monosaccharides.
E)  steroids.F) B) and C)
G) B) and D)

Question 14

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

Question 15

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of bond is found at "B"?

Accepted Answer

A)  oxygen atom
B)  polar covalent bond
C)  water molecule
D)  hydrogen atom
E)  hydrogen bondF) A) and E)
G) C) and D)

Question 16

What molecule is produced as a waste product of the metabolism of glucose by cells?

Accepted Answer

A)  water
B)  oxygen
C)  carbon monoxide
D)  nitrogen
E)  carbon dioxideF) D) and E)
G) A) and B)

Question 17

Which of the following statements best describes RNA?

Accepted Answer

A)  RNA is a double helix.
B)  RNA is a single-stranded molecule.
C)  RNA molecules are antiparallel.
D)  RNA contains the base thymine.
E)  RNA is found outside a cell.F) B) and C)
G) C) and D)

Question 18

-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 19

A neutral atom contains

Accepted Answer

A)  more protons than electrons.
B)  more electrons than protons.
C)  the same number of electrons and protons.
D)  only neutrons.
E)  None of these choices is correct.F) A) and D)
G) A) and C)

Question 20

Denaturation is

Accepted Answer

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

Exam 2: The Chemical Basis of Life

Large carbohydrates are formed from smaller units called

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What molecule is produced as a waste product of the metabolism of glucose by cells?

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Which of the following is a proton donor?

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

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Denaturation is

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Cellulose is the

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Enzymes are proteins that increase the rate of chemical reactions by

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

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A neutral atom contains

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-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of bond is found at "B"?

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Which of the following statements best describes RNA?

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An electrolyte is

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Which of the following organic groups does hemoglobin belong to?

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Inorganic chemists study substances _______ carbon,while organic chemists study substances _______ carbon.

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Potential energy is

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Glucose is the

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Subatomic particles located around the nucleus of an atom are

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In an oxidation-reduction reaction,______ are transferred between molecules

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Hydrogen bonds form between molecules containing _________ bonds; the hydrogen bond is between a hydrogen atom of one molecule and a partially _________ charged atom of another.

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Which of the following is determined by sequence of amino acids bound by peptide bonds?

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Inorganic chemists study substances _ carbon,while organic chemists study substances _ carbon.

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Hydrogen bonds form between molecules containing _ bonds; the hydrogen bond is between a hydrogen atom of one molecule and a partially _ charged atom of another.

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