Question 1

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 ringsF) B) and E)
G) C) and D)

Question 2

Ice floats on water because:

Accepted Answer

A)  The molecules are closer together in ice than in water
B)  The molecules are farther apart in ice than in water
C)  Ice is more dense than waterD) A) and C)
E) None of the above

Question 3

In making beer,barley is partially fermented to produce malt.Barley is not sweet,but the malt is.What is the best explanation for this observation?

Accepted Answer

A)  Fermentation allows the barley to make simple sugars from sunlight and carbon dioxide
B)  Fermentation releases sugars stored in organelles in the barley
C)  Fermentation causes the starch in the barley to taste sweet
D)  The fermentation breaks starch in the barley down into simple sugars in the malt
E)  Fermentation breaks down the simple sugars in the barleyF) B) and D)
G) B) and C)

Question 4

Which question can evolution not explain?

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

Question 5

Blood pH is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H+ ions in a patient with a blood pH of 6.4?

Accepted Answer

A)  H+ concentration is decreased 10-fold
B)  H+ concentration is decreased 2-fold
C)  H+ concentration is increased 2-fold
D)  H+ concentration is decreased 4-fold
E)  H+ concentration is increased 10-foldF) All of the above
G) A) and B) E

Question 6

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 are correctF) B) and D)
G) A) and E) E

Question 7

A substance having a pH of 8 would best be described as:

Accepted Answer

A)  Neutral
B)  A weak base
C)  A weak acid
D)  A strong acid
E)  A strong baseF) B) and C)
G) B) and E)

Question 8

A peptide bond:

Accepted Answer

A)  Is an ionic bond in proteins
B)  Is a covalent bond in carbohydrates
C)  Is a covalent bond in proteins
D)  Is an ionic bond in carbohydratesE) A) and C)
F) All of the above

Question 9

A hydrogen bond:

Accepted Answer

A)  Is a strong bond
B)  Does not occur within a molecule
C)  May occur between molecules
D)  Is not important to living cells
E)  Usually has a hydrogen atom with a partial negative chargeF) All of the above
G) C) and D)

Question 10

In a chemical equation:

Accepted Answer

A)  The reactants are on the right of the yields arrow
B)  Reactants and products are on both sides of the yields arrow
C)  The products are on the left of the yields arrow
D)  The reactants are on the left of the yields arrow
E)  The number of atoms of each element may be different on the two sides of the yields arrowF) C) and D)
G) None of the above

Question 11

The primary building block (monomer) of nucleic acids is:

Accepted Answer

A)  A nucleotide
B)  A glucose molecule
C)  A fatty acid
D)  An amino acid
E)  Four interconnected ringsF) B) and D)
G) A) and D)

Question 12

Water is best described as which of the following?

Accepted Answer

A)  An ion
B)  A non-polar molecule
C)  An atom
D)  A polar molecule
E)  An elementF) A) and D)
G) All of the above

Question 13

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 are correctF) A) and E)
G) B) and D)

Question 14

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 orbitalsF) D) and E)
G) All of the above C

Question 15

If a protein is denatured,its structure has been changed enough to make the protein nonfunctional.

Accepted Answer

A) True 
 B)False

Question 16

If ice were more dense than water,then during the winter most organisms living in ponds and lakes in colder climates would become entrapped in ice and freeze.

Accepted Answer

A) True 
 B)False

Question 17

If a covalent bond is polar:

Accepted Answer

A)  Electrons are not shared by atoms
B)  Protons are shared by atoms
C)  The bond is not important to living cells
D)  One of the atoms has a partial negative charge
E)  The bond is not a strong bondF) A) and B)
G) B) and D)

Question 18

Saturated fats have long straight tails of fatty acids,while unsaturated fats from vegetables have kinks in their tails due to double bonds.These kinks prevent the fats from packing together as tightly.Hydrogenated vegetable oils have hydrogens added back to the double bonds and thus behave like ____.

Accepted Answer

A)  Unsaturated fats
B)  Waxes
C)  Carbohydrates
D)  Protein
E)  Saturated fatsF) A) and D)
G) C) and D)

Question 19

What is significant about detecting uracil in meteorites?

Accepted Answer

A)  Uracil is found in DNA which is thought to be the original genetic material
B)  Uracil is a precursor for many other biological molecules including DNA and proteins
C)  Uracil is a very complex molecule that can only be made in living cells, thus confirming that extraterrestrial life exists
D)  Uracil is found in RNA which is thought to be the original genetic material
E)  Uracil can catalyze reactionsF) B) and E)
G) C) and E)

Question 20

Organic molecules are defined as chemical compounds that contain:

Accepted Answer

A)  Carbon
B)  Carbon and oxygen
C)  Carbon and nitrogen
D)  Carbon, hydrogen, and nitrogen
E)  Carbon and hydrogenF) C) and D)
G) A) and B)

Exam 2: The Chemistry of Life

The primary building block (monomer) of proteins is:

Correct Answer
verified

Ice floats on water because:

Correct Answer
verified

In making beer,barley is partially fermented to produce malt.Barley is not sweet,but the malt is.What is the best explanation for this observation?

Correct Answer
verified

Which question can evolution not explain?

Correct Answer
verified

Blood pH is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Correct Answer
verified
E

An ion is:

Correct Answer
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E

A substance having a pH of 8 would best be described as:

Correct Answer
verified

A peptide bond:

Correct Answer
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A hydrogen bond:

Correct Answer
verified

In a chemical equation:

Correct Answer
verified

The primary building block (monomer) of nucleic acids is:

Correct Answer
verified

Water is best described as which of the following?

Correct Answer
verified

An acid:

Correct Answer
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The atomic number of an atom or element is:

Correct Answer
verified
C

If a protein is denatured,its structure has been changed enough to make the protein nonfunctional.

Correct Answer
verified

If ice were more dense than water,then during the winter most organisms living in ponds and lakes in colder climates would become entrapped in ice and freeze.

Correct Answer
verified

If a covalent bond is polar:

Correct Answer
verified

Correct Answer
verified

What is significant about detecting uracil in meteorites?

Correct Answer
verified

Organic molecules are defined as chemical compounds that contain:

Correct Answer
verified

Exam 2: The Chemistry of Life

The primary building block (monomer) of proteins is:

Correct AnswerverifiedShow Answer

Ice floats on water because:

Correct AnswerverifiedShow Answer

In making beer,barley is partially fermented to produce malt.Barley is not sweet,but the malt is.What is the best explanation for this observation?

Correct AnswerverifiedShow Answer

Which question can evolution not explain?

Correct AnswerverifiedShow Answer

Blood pH is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H+ ions in a patient with a blood pH of 6.4?

Correct AnswerverifiedE

An ion is:

Correct AnswerverifiedE

A substance having a pH of 8 would best be described as:

Correct AnswerverifiedShow Answer

A peptide bond:

Correct AnswerverifiedShow Answer

A hydrogen bond:

Correct AnswerverifiedShow Answer

In a chemical equation:

Correct AnswerverifiedShow Answer

The primary building block (monomer) of nucleic acids is:

Correct AnswerverifiedShow Answer

Water is best described as which of the following?

Correct AnswerverifiedShow Answer

An acid:

Correct AnswerverifiedShow Answer

The atomic number of an atom or element is:

Correct AnswerverifiedC

If a protein is denatured,its structure has been changed enough to make the protein nonfunctional.

Correct AnswerverifiedShow Answer

If ice were more dense than water,then during the winter most organisms living in ponds and lakes in colder climates would become entrapped in ice and freeze.

Correct AnswerverifiedShow Answer

If a covalent bond is polar:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is significant about detecting uracil in meteorites?

Correct AnswerverifiedShow Answer

Organic molecules are defined as chemical compounds that contain:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Blood pH is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Correct Answer
verified
E

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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