Question 1

The most common isotope of carbon is 12C.14C has ____ than 12C.

Accepted Answer

A)  more protons
B)  more neutrons
C)  fewer neutrons
D)  fewer protons
E)  more electronsF) C) and D)
G) All of the above

Question 2

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

Question 3

How are the monomers in nucleic acids joined?

Accepted Answer

A)  peptide bonds between carbohydrates
B)  peptide bonds between amino acids
C)  phosphodiester bonds between amino acids
D)  peptide bonds between nucleotides
E)  phosphodiester bonds between nucleotidesF) B) and E)
G) A) and B)

Question 4

The atomic number of an atom or element is

Accepted Answer

A)  the number of neutrons in the nucleus.
B)  the number of electrons in the nucleus.
C)  the number of protons in the nucleus.
D)  the number of neutrons in the orbitals.
E)  the number of protons in the orbitals.F) B) and C)
G) None of the above

Question 5

The four nitrogenous bases found in RNA are

Accepted Answer

A)  glycerol,phosphate,adenine,and glucose.
B)  adenine,cytosine,guanine,and uracil.
C)  adenine,thymine,cytosine,and uracil.
D)  thymine,cytosine,guanine,and uracil.
E)  adenine,thymine,guanine,and cytosinE.F) C) and E)
G) A) and C)

Question 6

Human blood,saliva,tears,bile,and urine are close to neutral.Why is human stomach acid very acidic?

Accepted Answer

A)  It must break down eaten polymers into monomers.
B)  It is not acidic in the stomach,but rather strongly basic.
C)  To stomach acid will absorb excess H+ in the stomach.
D)  The stomach acids will add OH- to help digest fooD.
E)  The stomach acid neutralizes H+ and OH- from the consumed foods.F) A) and D)
G) None of the above

Question 7

The primary function of hemoglobin is to regulate the level of sugar in the blood.

Accepted Answer

A) True 
 B)False

Question 8

Ice floats on liquid water because

Accepted Answer

A)  the molecules are closer together in ice than in liquid water.
B)  the molecules are farther apart in ice than in liquid water.
C)  ice is denser than liquid water.
D)  convection currents caused by temperature differences push upwards on the ice.
E)  water vapor is less dense than liquid water.F) C) and E)
G) C) and D)

Question 9

The second energy shell of an atom contains a maximum of

Accepted Answer

A)  eight electrons.
B)  two electrons.
C)  four electrons.
D)  one electron.
E)  sixteen electrons.F) B) and E)
G) A) and E) A

Question 10

A substance with a pH of 6 is

Accepted Answer

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

Question 11

A process by which cells build large molecules from monomers is

Accepted Answer

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

Question 12

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 non-human organisms.
C)  rare on Earth.
D)  always bonded by hydrogen bonds.
E)  All answers are correct.F) B) and E)
G) A) and E)

Question 13

Evaporation is

Accepted Answer

A)  the conversion of a liquid into a vapor.
B)  the conversion of a solid into a vapor.
C)  the conversion of a vapor into a liquid.
D)  the conversion of a vapor into a soliD.
E)  All answers are correct.F) C) and D)
G) A) and D)

Question 14

An acid

Accepted Answer

A)  has a value above seven on the pH scale.
B)  is a chemical that takes hydrogen ions from a solution.
C)  has a value of seven on the pH scale.
D)  is a chemical that adds hydrogen ions to a solution.
E)  All answers are correct.F) B) and C)
G) None of the above

Question 15

Organic molecules are defined as chemical compounds that contain

Accepted Answer

A)  hydrophilic solutions.
B)  isotopes of carbon.
C)  ionically bonded atoms.
D)  strong hydrogen bonds.
E)  carbon and hydrogen.F) A) and E)
G) D) and E)

Question 16

In the example of ionic bond formation between sodium and chlorine

Accepted Answer

A)  Na is the chemical symbol for chlorine.
B)  sodium accepts an electron.
C)  chlorine accepts an electron.
D)  chlorine becomes positively chargeD.
E)  both sodium and chlorine accept electrons.F) A) and D)
G) B) and D)

Question 17

Which of the following is an example of a polar covalent bond?

Accepted Answer

A)  H2
B)  H2O
C)  O2
D)  the bond between separate water molecules
E)  H2 and H2OF) B) and E)
G) C) and E) B

Question 18

14C and 14N are both

Accepted Answer

A)  atoms.
B)  molecules.
C)  compounds.
D)  polymers.
E)  ions.F) All of the above
G) C) and D)

Question 19

A peptide bond is a covalent bond formed between amino acids.

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 2: The Chemistry of Life

The most common isotope of carbon is 12C.14C has ____ than 12C.

Correct AnswerverifiedShow Answer

A hydrogen bond

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How are the monomers in nucleic acids joined?

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The atomic number of an atom or element is

Correct AnswerverifiedShow Answer

The four nitrogenous bases found in RNA are

Correct AnswerverifiedShow Answer

Human blood,saliva,tears,bile,and urine are close to neutral.Why is human stomach acid very acidic?

Correct AnswerverifiedShow Answer

The primary function of hemoglobin is to regulate the level of sugar in the blood.

Correct AnswerverifiedShow Answer

Ice floats on liquid water because

Correct AnswerverifiedShow Answer

The second energy shell of an atom contains a maximum of

Correct AnswerverifiedA

A substance with a pH of 6 is

Correct AnswerverifiedShow Answer

A process by which cells build large molecules from monomers is

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Evaporation is

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An acid

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Organic molecules are defined as chemical compounds that contain

Correct AnswerverifiedShow Answer

In the example of ionic bond formation between sodium and chlorine

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Which of the following is an example of a polar covalent bond?

Correct AnswerverifiedB

14C and 14N are both

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A peptide bond is a covalent bond formed between amino acids.

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

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The most common isotope of carbon is ¹²C.¹⁴C has ____ than ¹²C.

Correct Answer
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A

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C

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B

¹⁴C and ¹⁴N are both

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