Question 1

Water is best described as which of the following?

Accepted Answer

A)  an ion
B)  a nonpolar molecule
C)  an atom
D)  a polar molecule
E)  an elementF) B) and E)
G) None of the above

Question 2

A substance with a pH of 7 is

Accepted Answer

A)  a weak acid.
B)  a weak base.
C)  neutral.
D)  a strong aciD.
E)  a strong basE.F) B) and E)
G) B) and C)

Question 3

If you wanted to add a factor to a culture grasshoppers to see if it might cause a color change,what might you try?

Accepted Answer

A)  bacteria
B)  seeds
C)  caffeine
D)  salt
E)  waxF) D) and E)
G) C) and D)

Question 4

If you add a factor to a culture of sap-sukcing mealy bugs,and they change color from red to green,what might you have added?

Accepted Answer

A)  bacteria
B)  seeds
C)  caffeine
D)  salt
E)  waxF) D) and E)
G) All of the above

Question 5

In a covalent bond

Accepted Answer

A)  atoms share electrons.
B)  atoms of opposite charges attract each other.
C)  atoms share protons.
D)  atoms share neutrons.
E)  atoms are repelled by each other.F) C) and D)
G) A) and C)

Question 6

An ionic bond is a bond in which

Accepted Answer

A)  atoms share electrons.
B)  atoms share protons.
C)  atoms of opposite charges attract each other.
D)  atoms share neutrons.
E)  atoms are repelled by each other.F) A) and E)
G) None of the above

Question 7

A process by which cells break polymers down into smaller units is

Accepted Answer

A)  hydrolysis.
B)  dehydration synthesis.
C)  reproduction.
D)  hydrolysis and dehydration synthesis.
E)  unrelated to chemical bonds.F) A) and C)
G) A) and B)

Question 8

Proteins are compound because they are polymers.

Accepted Answer

A) True 
 B)False

Question 9

An ion could be

Accepted Answer

A)  an atom that has gained electrons.
B)  an atom that has a positive charge.
C)  an atom that has lost electrons.
D)  an atom that has a negative charge.
E)  All answers are correct.F) B) and D)
G) B) and E)

Question 10

A hydrogen bond

Accepted Answer

A)  is generally a strong bond.
B)  does not occur in living organisms.
C)  does not require electron transfer.
D)  forms between atoms having the same electronegativity.
E)  is a specialized type of covalent bond.F) C) and D)
G) B) and E)

Question 11

14C and 14N have the same

Accepted Answer

A)  atomic number.
B)  number of protons.
C)  atomic mass.
D)  number of neutrons.
E)  number of electrons.F) C) and D)
G) All of the above

Question 12

The primary building block (monomer) of proteins is

Accepted Answer

A)  a glucose molecule.
B)  a fatty acid.
C)  a nucleotide.
D)  an amino aciD.
E)  four interconnected rings.F) B) and E)
G) B) and D)

Question 13

A base

Accepted Answer

A)  has a value of 7 on the pH scale.
B)  is a chemical that adds hydrogen ions to a solution.
C)  is a chemical that absorbs hydrogen ions from a solution.
D)  has a value below 7 on the pH scale.E) C) and D)
F) A) and C) C

Question 14

If a covalent bond is polar

Accepted Answer

A)  electrons are not shared by atoms.
B)  protons are shared by atoms.
C)  it will not form in living organisms.
D)  the electronegativity of atoms is unequal in their pull on electrons.
E)  the bond is weak in strength.F) C) and E)
G) A) and D)

Question 15

An acid

Accepted Answer

A)  has a value above 7 on the pH scale.
B)  is a chemical that takes hydrogen ions from a solution.
C)  has a value of 7 on the pH scale.
D)  is a chemical that adds hydrogen ions to a solution.
E)  All answers are correct.F) All of the above
G) B) and C) D

Question 16

As part of an exam,you are given a powder to analyze.When you perform various tests,you find that it contains a single chemical that changes the pH of neutral water to a pH of 6.You would conclude that the chemical is a

Accepted Answer

A)  weak acid.
B)  neutral.
C)  weak base.
D)  strong aciD.
E)  strong basE.F) A) and C)
G) A) and B)

Question 17

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Accepted Answer

A)  also the main elements in organic molecules.
B)  rare in nonhuman organisms.
C)  rare on Earth.
D)  always bonded by hydrogen bonds.
E)  All answers are correct.F) A) and B)
G) B) and E)

Question 18

The four major groups of organic compounds are

Accepted Answer

A)  fats,waxes,carbohydrates,and amino acids.
B)  carbohydrates,lipids,steroids,and monosaccharides.
C)  lipids,fats,waxes,and steroids.
D)  carbohydrates,lipids,proteins,and nucleic acids.
E)  carbohydrates,proteins,amino acids,and nucleic acids.F) A) and B)
G) C) and D)

Question 19

If you sprayed antibiotics on purple insects,and they changed color,what did the antibiotics most likely affect?

Accepted Answer

A)  bacteria
B)  seeds
C)  caffeine
D)  salt
E)  waxF) All of the above
G) B) and C) A

Question 20

A substance with a pH of 2 is

Accepted Answer

A)  neutral.
B)  a weak acid.
C)  a weak base.
D)  a strong base.
E)  a strong acid.F) C) and D)
G) D) and E)

Exam 2: The Chemistry of Life

Water is best described as which of the following?

Correct AnswerverifiedShow Answer

A substance with a pH of 7 is

Correct AnswerverifiedShow Answer

If you wanted to add a factor to a culture grasshoppers to see if it might cause a color change,what might you try?

Correct AnswerverifiedShow Answer

If you add a factor to a culture of sap-sukcing mealy bugs,and they change color from red to green,what might you have added?

Correct AnswerverifiedShow Answer

In a covalent bond

Correct AnswerverifiedShow Answer

An ionic bond is a bond in which

Correct AnswerverifiedShow Answer

A process by which cells break polymers down into smaller units is

Correct AnswerverifiedShow Answer

Proteins are compound because they are polymers.

Correct AnswerverifiedShow Answer

An ion could be

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A hydrogen bond

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14C and 14N have the same

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The primary building block (monomer) of proteins is

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A base

Correct AnswerverifiedC

If a covalent bond is polar

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An acid

Correct AnswerverifiedD

As part of an exam,you are given a powder to analyze.When you perform various tests,you find that it contains a single chemical that changes the pH of neutral water to a pH of 6.You would conclude that the chemical is a

Correct AnswerverifiedShow Answer

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Correct AnswerverifiedShow Answer

The four major groups of organic compounds are

Correct AnswerverifiedShow Answer

If you sprayed antibiotics on purple insects,and they changed color,what did the antibiotics most likely affect?

Correct AnswerverifiedA

A substance with a pH of 2 is

Correct AnswerverifiedShow Answer

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¹⁴C and ¹⁴N have the same

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C

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D

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A

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