Question 1

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

Accepted Answer

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

Question 2

An atom of chlorine has 17 protons and 18 neutrons. Which of the following statements is true?

Accepted Answer

A)   Chlorine has an atomic number of 18.
B)   Chlorine atoms have 18 electrons.
C)   Chlorine has an atomic number of 35.
D)   Chlorine has 35 electrons.
E)   Chlorine has a mass number of 35.F) B) and E)
G) A) and E)

Question 3

Solubility refers to the ability of one substance to ___________ in another.

Accepted Answer

A)   react
B)   dissolve
C)   precipitate
D)   conduct
E)   None of these choices are correct.F) B) and E)
G) A) and D)

Question 4

The model that helps explain how an enzyme works is the

Accepted Answer

A)   three-dimensional model.
B)   denaturation model.
C)   activation model.
D)   lock-and-key model.E) A) and B)
F) None of the above

Question 5

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 6

Which of the following best describes a proton?

Accepted Answer

A)   one negative charge, no mass, found in orbitals
B)   no charge, mass of one, found in nucleus
C)   one positive charge, mass of one, found in nucleus
D)   subatomic particle with no electric charge
E)   None of these choices is correct.F) B) and E)
G) B) and D)

Question 7

The amount of matter in an object is its

Accepted Answer

A)   size.
B)   weight.
C)   density.
D)   volume.
E)   mass.F) A) and B)
G) C) and D)

Question 8

-The sodium chloride molecule breaks apart in water. What does "E" represent (the process) ?

Accepted Answer

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

Question 9

-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 "A"?

Accepted Answer

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

Question 10

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

Accepted Answer

A)   reversible
B)   synthesis
C)   oxidation
D)   dehydration
E)   hydrolysisF) A) and E)
G) D) and E)

Question 11

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

Accepted Answer

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

Question 12

Normal blood pH is maintained within a range of

Accepted Answer

A)   6.5 - 9.5.
B)   4.5 - 5.5.
C)   1.0 - 14.0.
D)   7.35 - 7.45.
E)   7.35 - 8.5.F) A) and B)
G) C) and E)

Question 13

-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) D) and E)
G) A) and B)

Question 14

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 E)
G) A) and D)

Question 15

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

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

Which of the following lists includes only monosaccharides that are isomers of one another?

Accepted Answer

A)   starch, glycogen, cellulose
B)   glucose, fructose, galactose
C)   ribose, glycogen, glucose
D)   glycogen, glucose, sucrose
E)   deoxyribose, glycogen, starchF) C) and E)
G) B) and E)

Question 19

Which of the following organic groups does a steroid belong to?

Accepted Answer

A)   carbohydrate
B)   nucleic acid
C)   protein
D)   lipid
E)   vitaminF) A) and C)
G) A) and B)

Question 20

A neutral atom will become a cation if it

Accepted Answer

A)   gains neutrons.
B)   gains electrons.
C)   loses protons.
D)   gains protons.
E)   loses electrons.F) A) and E)
G) B) and C)

Exam 2: The Chemical Basis of Life

Which of the following best describes a proton?

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

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

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Normal blood pH is maintained within a range of

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

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A neutral atom will become a cation if it

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-The sodium chloride molecule breaks apart in water. What does "E" represent (the process) ?

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An atom of chlorine has 17 protons and 18 neutrons. Which of the following statements is true?

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Which of the following is NOT true of enzymes?

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Which of the following lists includes only monosaccharides that are isomers of one another?

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

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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 "A"?

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The model that helps explain how an enzyme works is the

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An electrolyte is

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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 atom is found at "C"?

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Which of the following is a proton donor?

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Which of the following organic groups does a steroid belong to?

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

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Solubility refers to the ability of one substance to ___________ in another.

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The amount of matter in an object is its

Correct AnswerverifiedShow Answer

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