Question 1

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

Accepted Answer

A)  I131
B)  C14
C)  glucose
D)  H2
E)  All of the above can be used.F) A) and B)
G) A) and C)

Question 2

Determine which of the following components are required for a molecule to be classified as organic.

Accepted Answer

A)  presence of carbon,hydrogen,four electrons in the outer orbital,and the attachment of a functional group
B)  presence of sodium,chlorine,four electrons in the outer orbital,and the attachment of a functional group
C)  presence of carbon,hydrogen,three electrons in the outer orbital,and the attachment of a functional group
D)  presence of oxygen,hydrogen,four electrons in the outer orbital,and the attachment of a functional group
E)  presence of carbon,hydrogen,four protons in the outer orbital,and the attachment of a functional groupF) A) and E)
G) C) and E)

Question 3

All carbohydrate molecules

Accepted Answer

A)  contain amino acids.
B)  contain nitrogen and phosphate.
C)  are organic acids.
D)  are composed of atoms of C,H,and the functional group -OH.
E)  are composed of atoms of C,H,O,and N.F) All of the above
G) B) and D)

Question 4

Which of the following molecules is NOT a compound?

Accepted Answer

A)  H2O
B)  HCl
C)  H2
D)  C6H12O6
E)  NaOHF) A) and B)
G) A) and C)

Question 5

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Accepted Answer

A)  ions.
B)  hydrophilic.
C)  hydrophobic.
D)  basic.
E)  acidic.F) D) and E)
G) A) and B)

Question 6

Maltose is classified as a

Accepted Answer

A)  nucleic acid.
B)  fatty acid.
C)  protein.
D)  carbohydrate.
E)  lipid.F) C) and D)
G) A) and D)

Question 7

Which of the following is not a function of ATP within the cell?

Accepted Answer

A)  All of the answer choices are functions of ATP within the cell.
B)  conduction of nerve impulses
C)  contraction of muscle cells
D)  synthesis of macromolecules
E)  energy currency of the cellF) A) and C)
G) C) and D)

Question 8

Removal of the hydroxyl functional group would disrupt the structure of

Accepted Answer

A)  sugars and some amino acids.
B)  sugars.
C)  fatty acids and amino acids.
D)  nucleotides and phospholipids.
E)  nucleotides and fatty acids.F) None of the above
G) A) and D)

Question 9

Isotopes of a given element have

Accepted Answer

A)  the same number of protons but differ in atomic mass.
B)  the same atomic mass but a different number of protons.
C)  a different number of electrons.
D)  the same number of protons and atomic mass.
E)  the same number of neutrons.F) C) and D)
G) B) and C)

Question 10

Potassium hydroxide (KOH) almost completely dissociates in aqueous solution into K+ and OH-,which means it is a

Accepted Answer

A)  strong acid.
B)  strong base.
C)  weak base.
D)  weak acid.
E)  nonpolar covalent molecule.F) B) and C)
G) A) and D)

Question 11

Which type of bond formation is responsible for the properties of water?

Accepted Answer

A)  hydrogen
B)  polar covalent
C)  ionic
D)  nonpolar covalent
E)  None of these bonds play a role in the properties of water.F) All of the above
G) C) and E)

Question 12

DNA codes for the sequence of amino acids in the primary structure of a protein,but not for sugars or lipids.This is because

Accepted Answer

A)  only proteins are involved in living metabolic reactions.
B)  sugars and lipids code for their own replication.
C)  sugars and lipids are ever present in the living environment and are not used in living structures.
D)  other hereditary molecules code for sugars and lipids.
E)  proteins are the main structural and functional components of cells.F) A) and D)
G) A) and E)

Question 13

Which group of lipids will contain a barrier formed by hydrophilic heads that face outwards and hydrophobic tails that face inwards?

Accepted Answer

A)  phospholipids
B)  steroids
C)  triglycerides
D)  saturated acids
E)  trans-fatty acidsF) A) and B)
G) A) and E)

Question 14

Which of the following statements is NOT true of chemical bonds?

Accepted Answer

A)  Both ionic and covalent bonds involve electrons in the outer shell.
B)  Covalent bonds share electrons between two atoms.
C)  An atom involved in an ionic bond has an unequal number of electrons and protons.
D)  Salts are covalently bonded.
E)  The atoms in a molecule of water (H2O) are covalently bound together.F) C) and D)
G) A) and C)

Question 15

The moon lacks life and varies dramatically in temperature.If we could keep a layer of water spread on the surface of the moon,what effect would it have?

Accepted Answer

A)  Life would be possible but it would have to withstand these extremes in temperature.
B)  Water would absorb and hold heat and moderate the temperature extremes.
C)  The temperatures would drop to the lower extremes.
D)  Because water has a high heat of vaporization,the temperatures would rise to the upper extremes.
E)  Physical conditions would remain the same.F) B) and D)
G) A) and D)

Question 16

____ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Accepted Answer

A)  Cellulose
B)  Chitin
C)  Glycogen
D)  Starch
E)  CholesterolF) B) and E)
G) D) and E)

Question 17

Which statement regarding acids and bases is correct?

Accepted Answer

A)  Acids increase the pH,and bases decrease the pH.
B)  Acids increase the proportion of hydrogen ions (H+) ,and bases reduce the proportion of H+.
C)  Acids are harmful,but bases are not harmful.
D)  Acids combine with bases to form buffers.
E)  Acids combine with bases to form sugars.F) C) and E)
G) A) and B)

Question 18

Hydrolysis of a fat results in

Accepted Answer

A)  glycerol only.
B)  fatty acids only.
C)  glucose only.
D)  two monosaccharides.
E)  both glycerol and fatty acids.F) D) and E)
G) A) and E)

Exam 2: The Molecules of Cells

Isotopes of a given element have

Correct Answer
verified

Which of the following statements is NOT true of chemical bonds?

Correct Answer
verified

Which group of lipids will contain a barrier formed by hydrophilic heads that face outwards and hydrophobic tails that face inwards?

Correct Answer
verified

Which type of bond formation is responsible for the properties of water?

Correct Answer
verified

Removal of the hydroxyl functional group would disrupt the structure of

Correct Answer
verified

Hydrolysis of a fat results in

Correct Answer
verified

DNA codes for the sequence of amino acids in the primary structure of a protein,but not for sugars or lipids.This is because

Correct Answer
verified

All carbohydrate molecules

Correct Answer
verified

Maltose is classified as a

Correct Answer
verified

Which of the following is not a function of ATP within the cell?

Correct Answer
verified

Potassium hydroxide (KOH) almost completely dissociates in aqueous solution into K⁺ and OH^-,which means it is a

Correct Answer
verified

The moon lacks life and varies dramatically in temperature.If we could keep a layer of water spread on the surface of the moon,what effect would it have?

Correct Answer
verified

____ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Correct Answer
verified

Determine which of the following components are required for a molecule to be classified as organic.

Correct Answer
verified

Which statement regarding acids and bases is correct?

Correct Answer
verified

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Correct Answer
verified

Which of the following molecules is NOT a compound?

Correct Answer
verified

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

Correct Answer
verified

Exam 2: The Molecules of Cells

Isotopes of a given element have

Correct AnswerverifiedShow Answer

Which of the following statements is NOT true of chemical bonds?

Correct AnswerverifiedShow Answer

Which group of lipids will contain a barrier formed by hydrophilic heads that face outwards and hydrophobic tails that face inwards?

Correct AnswerverifiedShow Answer

Which type of bond formation is responsible for the properties of water?

Correct AnswerverifiedShow Answer

Removal of the hydroxyl functional group would disrupt the structure of

Correct AnswerverifiedShow Answer

Hydrolysis of a fat results in

Correct AnswerverifiedShow Answer

DNA codes for the sequence of amino acids in the primary structure of a protein,but not for sugars or lipids.This is because

Correct AnswerverifiedShow Answer

All carbohydrate molecules

Correct AnswerverifiedShow Answer

Maltose is classified as a

Correct AnswerverifiedShow Answer

Which of the following is not a function of ATP within the cell?

Correct AnswerverifiedShow Answer

Potassium hydroxide (KOH) almost completely dissociates in aqueous solution into K+ and OH-,which means it is a

Correct AnswerverifiedShow Answer

The moon lacks life and varies dramatically in temperature.If we could keep a layer of water spread on the surface of the moon,what effect would it have?

Correct AnswerverifiedShow Answer

____ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Correct AnswerverifiedShow Answer

Determine which of the following components are required for a molecule to be classified as organic.

Correct AnswerverifiedShow Answer

Which statement regarding acids and bases is correct?

Correct AnswerverifiedShow Answer

The water strider is an insect that skates across the water without sinking.The tips of its feet must be coated with molecules that are

Correct AnswerverifiedShow Answer

Which of the following molecules is NOT a compound?

Correct AnswerverifiedShow Answer

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

Correct AnswerverifiedShow Answer

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Potassium hydroxide (KOH) almost completely dissociates in aqueous solution into K⁺ and OH^-,which means it is a

Correct Answer
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