Question 1

How are the monomers in proteins joined?

Accepted Answer

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

Question 2

The first energy shell of an atom contains a maximum of

Accepted Answer

A)  one electron.
B)  two electrons.
C)  four electrons.
D)  eight electrons.
E)  sixteen electrons.F) None of the above
G) All of the above

Question 3

Individual water molecules bind to each other with

Accepted Answer

A)  covalent bonds.
B)  ionic bonds.
C)  hydrogen bonds.
D)  hydrophobic bonds.
E)  peptide bonds.F) C) and E)
G) B) and D)

Question 4

The primary elements making up living organisms are

Accepted Answer

A)  carbon,hydrogen,oxygen,and calcium.
B)  carbon,oxygen,iron,and chlorine.
C)  carbon,hydrogen,iron,and calcium.
D)  carbon,hydrogen,oxygen,and nitrogen.
E)  carbon,oxygen,sulfur,and calcium.F) C) and D)
G) B) and C)

Question 5

Trees are able to transport water hundreds of feet up from the roots because of

Accepted Answer

A)  water's high density.
B)  cohesion of the water molecules.
C)  water's high boiling point.
D)  adhesion of tree molecules with the water molecules.
E)  a neutral pH.F) A) and E)
G) A) and B)

Question 6

In the section "Investigating Life:E. T. and the Origin of Life," which of the following conclusions can be made from the data table?

Accepted Answer

A)  Glycine is a less abundant amino acid in the meteorite than in terrestrial samples.
B)  15N is more abundant in amino acids from the meteorite than from terrestrial samples.
C)  Amino acids in the meteorite contain more carbon than amino acids from terrestrial samples.
D)  13C is more abundant in amino acids from terrestrial samples than from the meteorite.
E)  Uracil is a more abundant amino acid in the meteorite than in terrestrial samples.F) None of the above
G) A) and B)

Question 7

In the section "Investigating Life:: E. T. and the Origin of Life," which question cannot be explained by evolution?

Accepted Answer

A)  The diversity of species on Earth
B)  The common ancestry of all species on Earth
C)  How life started on Earth
D)  The same types of molecules are found in all organisms
E)  The origin of new speciesF) C) and D)
G) B) and D)

Question 8

A nucleotide contains which of the following?

Accepted Answer

A)  amino acid and nitrogenous bases
B)  saturated and unsaturated fatty acids
C)  sugar,nitrogenous base,and phosphate
D)  amino acid and saccharide
E)  fatty acid,glycerol,and phosphateF) C) and E)
G) B) and E)

Question 9

It is biologically important that pure water has a neutral pH,so that it does not alter the internal pH of organisms or pH of ecosystems.

Accepted Answer

A) True 
 B)False

Question 10

Hydrogen has 1 proton,0 neutrons,and 1 electron.Which of the following is correct about hydrogen?

Accepted Answer

A)  Hydrogen has an atomic number of 1.
B)  Hydrogen has an atomic number of 2.
C)  Hydrogen has an atomic mass of 2.
D)  Hydrogen has an atomic number and atomic mass of 2.
E)  Hydrogen has an atomic number and atomic mass of 1.F) B) and D)
G) None of the above

Question 11

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) All of the above
G) A) and B)

Question 12

In the section "Investigating Life:E. T. and the Origin of Life," why were amino acids analyzed for ¹⁵N levels?

Accepted Answer

A)  Nitrogen is not present in nucleotides or carbohydrates.
B)  Nitrogen is not present in nucleotides or lipids.
C)  Nitrogen is not present in carbohydrates or lipids.
D)  Nitrogen is not present in amino acids or carbohydrates.
E)  Nitrogen is not present in nucleotides or amino acids.F) C) and D)
G) A) and B)

Question 13

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) All of the above
G) A) and E)

Question 14

The mass number of an atom is defined as

Accepted Answer

A)  the total number of protons,neutrons,and electrons of an atom.
B)  the total number of protons and electrons of an atom.
C)  the total number of protons and neutrons of an atom.
D)  the total number of neutrons and electrons of an atom.
E)  the total number of protons of an atom.F) None of the above
G) A) and D)

Question 15

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) A) and B)
G) A) and C)

Question 16

A fatty acid is unsaturated if there is at least one double bond between the carbon atoms in the hydrocarbon chains.

Accepted Answer

A) True 
 B)False

Question 17

An ion is

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) A) and B)
G) All of the above

Question 18

Ice is less dense than liquid water,allowing organisms in ponds to live underneath the ice at the surface of the water,instead of trapped in the ice at the bottom of the pond.

Accepted Answer

A) True 
 B)False

Question 19

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 D)
G) A) and C)

Question 20

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) A) and E)
G) None of the above

Exam 2: The Chemistry of Life

Hydrogen has 1 proton,0 neutrons,and 1 electron.Which of the following is correct about hydrogen?

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A nucleotide contains which of the following?

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In the section "Investigating Life:: E. T. and the Origin of Life," which question cannot be explained by evolution?

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A substance with a pH of 2 is

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Ice is less dense than liquid water,allowing organisms in ponds to live underneath the ice at the surface of the water,instead of trapped in the ice at the bottom of the pond.

Correct AnswerverifiedShow Answer

Individual water molecules bind to each other with

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A fatty acid is unsaturated if there is at least one double bond between the carbon atoms in the hydrocarbon chains.

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In the section "Investigating Life:E. T. and the Origin of Life," which of the following conclusions can be made from the data table?

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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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The mass number of an atom is defined as

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The four major groups of organic compounds are

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In a covalent bond

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The first energy shell of an atom contains a maximum of

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Trees are able to transport water hundreds of feet up from the roots because of

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How are the monomers in proteins joined?

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An ion is

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It is biologically important that pure water has a neutral pH,so that it does not alter the internal pH of organisms or pH of ecosystems.

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The primary elements making up living organisms are

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In the section "Investigating Life:E. T. and the Origin of Life," why were amino acids analyzed for ¹⁵N levels?

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¹⁴C and ¹⁴N have the same

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