Question 1

In the section "Investigating Life:E. T. and the Origin of Life," how are ¹³C and ¹⁵N different from the more abundant isotopes¹²C and ¹⁴N?

Accepted Answer

A)  13C and 15N each have one more neutron more than 12C and 14N.
B)  13C and 15N each have one more proton than 12C and 14N.
C)  13C and 15N each have one less neutron than 12C and 14N.
D)  13C and 15N each have one less proton than 12C and 14N.
E)  13C and 15N each have one less electron than 12C and 14N.F) D) and E)
G) C) and D)

Question 2

In the section "Investigating Life:E. T. and the Origin of Life," what is significant about detecting high levels of amino acids, uracil, and xanthine in the meteorite?

Accepted Answer

A)  The meteorite originated from Earth.
B)  The biological molecules contaminated the meteorite when it hit Earth.
C)  Life exists somewhere else in our universe besides Earth.
D)  Biological molecules are formed outside of Earth.
E)  The meteorite was once living material.F) C) and D)
G) A) and E)

Question 3

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 carbohydrates.
E)  is a hydrogen bond in nucleic acids.F) A) and D)
G) A) and B)

Question 4

Many digestive enzymes are hydrolases which carry out hydrolysis.What do these enzymes have in common?

Accepted Answer

A)  They use water to form bonds between monomers.
B)  They use water to break bonds in monomers.
C)  They use water to break bonds in polymers.
D)  They use water to form bonds between polymers.
E)  They release water in forming bonds between monomers.F) A) and E)
G) B) and E)

Question 5

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

Question 6

Nucleic acids are to nucleotides like amino acids are to proteins and monosaccharides are to carbohydrates.

Accepted Answer

A) True 
 B)False

Question 7

Saturated fats have long straight tails of fatty acids,while unsaturated fats have kinks in their tails created by the double bonds.The kinks prevent the fatty acids 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 E)
G) C) and D)

Question 8

A substance in which other substances dissolve is called a solute.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Examples of monosaccharides are

Accepted Answer

A)  cellulose and sucrose.
B)  lactose and sucrose.
C)  glucose and fructose.
D)  glucose and cellulose.
E)  None of the answers are correct.F) A) and B)
G) B) and E)

Question 11

Which of the following is NOT an example of matter?

Accepted Answer

A)  wind
B)  energy
C)  light
D)  sound
E)  None of the answers are correct.F) C) and E)
G) C) and D)

Question 12

What essential function did lipids play in the origin of life?

Accepted Answer

A)  the formation of biological membranes
B)  storage of information
C)  catalysis of reactions
D)  formation of a cytoskeleton
E)  anaerobic fermentationF) A) and B)
G) C) and E)

Question 13

In the section "Investigating Life:E. T. and the Origin of Life," what hypothesis were the scientists testing?

Accepted Answer

A)  Organic molecules can be made on Earth.
B)  Extraterrestrial life can be detected on meteorites.
C)  Life can be created from a mixture of organic molecules.
D)  Low-oxygen conditions existed on Earth when production of organic molecules first began.
E)  Meteorites can bring organic molecules from extraterrestrial origins to Earth.F) A) and E)
G) B) and C)

Question 14

You can painlessly wade into a pool,but doing a belly flop off of the high diving board hurts because of ______.

Accepted Answer

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

Question 15

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 B)

Question 16

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-fold.F) None of the above
G) A) and E)

Question 17

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

Question 18

A substance with a pH of 8 is

Accepted Answer

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

Question 19

In the example of ionic bond formation between sodium and chlorine,which of the following is a false statement?

Accepted Answer

A)  Na is the chemical symbol for sodium.
B)  Chlorine donates an electron.
C)  Chlorine becomes negatively charged.
D)  Sodium becomes positively chargeD.
E)  The bond that is formed is a strong bond.F) A) and D)
G) B) and C)

Question 20

Cohesion is a property of water in which water molecules tend to stick together.

Accepted Answer

A) True 
 B)False

Exam 2: The Chemistry of Life

Cohesion is a property of water in which water molecules tend to stick together.

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Water is best described as which of the following?

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Which of the following is NOT an example of matter?

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A base

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In the section "Investigating Life:E. T. and the Origin of Life," what is significant about detecting high levels of amino acids, uracil, and xanthine in the meteorite?

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A peptide bond

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 AnswerverifiedShow Answer

A substance in which other substances dissolve is called a solute.

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Nucleic acids are to nucleotides like amino acids are to proteins and monosaccharides are to carbohydrates.

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

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In the example of ionic bond formation between sodium and chlorine,which of the following is a false statement?

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In the section "Investigating Life:E. T. and the Origin of Life," what hypothesis were the scientists testing?

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In the section "Investigating Life:E. T. and the Origin of Life," how are ¹³C and ¹⁵N different from the more abundant isotopes¹²C and ¹⁴N?

Correct AnswerverifiedShow Answer

What essential function did lipids play in the origin of life?

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

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Many digestive enzymes are hydrolases which carry out hydrolysis.What do these enzymes have in common?

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Examples of monosaccharides are

Correct AnswerverifiedShow Answer

A substance with a pH of 8 is

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An ionic bond is a bond in which

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You can painlessly wade into a pool,but doing a belly flop off of the high diving board hurts because of ______.

Correct AnswerverifiedShow Answer

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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?

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