Question 1

A dehydration reaction

Accepted Answer

A)  results in the addition of a water molecule.
B)  breaks down complex molecules to simple ones.
C)  is used to form polymers.
D)  forms glucose monomers from glycogen.
E)  form glycerol and fatty acids from triglycerides.F) B) and E)
G) A) and C)

Question 2

A protein's _______ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.

Accepted Answer

A)  primary
B)  secondary
C)  tertiary
D)  quaternary
E)  both secondary and quaternaryF) A) and C)
G) None of the above

Question 3

Glycogen is to animal cells as ________ is to plant cells.

Accepted Answer

A)  lipid
B)  cellulose
C)  starch
D)  protein
E)  sugarF) B) and E)
G) B) and D)

Question 4

When designing a butter with higher ratios of unsaturated fats you would need to take care not to remove all saturated fats.What is the main reason for this?

Accepted Answer

A)  Saturated fatty acids are linear in structure and form closely packed structures that are more solid at room temperature.
B)  Saturated fatty acids have more carbons in them creating a denser formation at room temperature.
C)  The length of saturated fatty acids are longer and interactions with unsaturated fatty acids form solid structures at room temperature.
D)  Unsaturated fatty acids on their own would make the butter to hard as they form strong hydrophobic bonds at room temperature.E) B) and C)
F) None of the above

Question 5

The largest molecule of the following is

Accepted Answer

A)  a monosaccharide.
B)  a disaccharide.
C)  a polysaccharide.
D)  glucose.
E)  sucrosE.F) A) and B)
G) B) and E)

Question 6

Saturated fats are composed of fatty acids with several double bonded carbons.

Accepted Answer

A) True 
 B)False

Question 7

Carbohydrate assembly occurs by

Accepted Answer

A)  a dehydration reaction between monosaccharides that form disaccharides,which then go on to form polysaccharides.
B)  a hydrolysis reaction between monosaccharides that form polysaccharides and disaccharides.
C)  a dehydration reaction between monosaccharides that form polysaccharides and disaccharides.
D)  a hydrolysis reaction between monosaccharides that form disaccharides,which then go on to form polysaccharides.E) B) and C)
F) B) and D)

Question 8

The most hydrophobic molecule is

Accepted Answer

A)  C2H5COOH
B)  C2H6
C)  R-NH2
D)  C3H7OH
E)  C5H10O5F) A) and D)
G) C) and D) B

Question 9

Acetic acid gives vinegar its sour taste.The functional group of this acid is

Accepted Answer

A)  -OH
B)  -NH2
C)  -SH
D)  -COOH
E)  -COF) B) and D)
G) A) and B)

Question 10

All amino acids within a protein are either polar charged or polar uncharged.

Accepted Answer

A) True 
 B)False

Question 11

When placed in an aqueous solution,amphipathic molecules will orient themselves with

Accepted Answer

A)  hydrophilic hydrocarbon chains pointing toward each other and away from the water.
B)  hydrophilic head groups pointing away from each other and towards the water.
C)  hydrophobic hydrocarbon chains pointing toward each other and away from the water.
D)  hydrophilic hydrocarbon chains in the middle and hydrophobic head groups facing the water.
E)  hydrophobic hydrocarbon chains in the middle,and hydrophilic head groups facing the water.F) A) and C)
G) D) and E)

Question 12

What structure best represents a polymer?

Accepted Answer

A)  A fatty acid.
B)  A monosaccharide.
C)  A nucleotide.
D)  An amino aciD.
E)  A protein.F) A) and B)
G) A) and C)

Question 13

The sole function of carbohydrates is to serve as energy stores.

Accepted Answer

A) True 
 B)False

Question 14

The functional group that forms a covalent bond between peptide chains and stabilizes protein tertiary structure is

Accepted Answer

A)  -NH2
B)  -COOH
C)  -PO4
D)  -SH
E)  -OHF) A) and E)
G) D) and E)

Question 15

The substance most rich in unsaturated fats is

Accepted Answer

A)  fat that is solid at room temperature.
B)  butter.
C)  beef fat.
D)  bacon grease.
E)  olive oil.F) B) and E)
G) A) and B) E

Question 16

Lipids and carbohydrates can both be used by animals to store energy.

Accepted Answer

A) True 
 B)False

Question 17

Macromolecules such as lipids and carbohydrates are produced from monomers through condensation reactions.

Accepted Answer

A) True 
 B)False

Question 18

The primary structure of a protein ultimately determines its three-dimensional structure.

Accepted Answer

A) True 
 B)False

Question 19

If sucrose is composed of both glucose and fructose,then sucrose must be a monosaccharide.

Accepted Answer

A) True 
 B)False

Question 20

The portion of an amino acid that makes it unique among the 20 different amino acids is its

Accepted Answer

A)  carboxyl group.
B)  amino group.
C)  hydrocarbon bonding.
D)  side chain or R-group.
E)  peptide bonding.F) B) and D)
G) B) and C) D

Exam 3: The Chemical Basis of Life II: Organic Molecules

A dehydration reaction

Correct AnswerverifiedShow Answer

A protein's _______ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.

Correct AnswerverifiedShow Answer

Glycogen is to animal cells as ________ is to plant cells.

Correct AnswerverifiedShow Answer

When designing a butter with higher ratios of unsaturated fats you would need to take care not to remove all saturated fats.What is the main reason for this?

Correct AnswerverifiedShow Answer

The largest molecule of the following is

Correct AnswerverifiedShow Answer

Saturated fats are composed of fatty acids with several double bonded carbons.

Correct AnswerverifiedShow Answer

Carbohydrate assembly occurs by

Correct AnswerverifiedShow Answer

The most hydrophobic molecule is

Correct AnswerverifiedB

Acetic acid gives vinegar its sour taste.The functional group of this acid is

Correct AnswerverifiedShow Answer

All amino acids within a protein are either polar charged or polar uncharged.

Correct AnswerverifiedShow Answer

When placed in an aqueous solution,amphipathic molecules will orient themselves with

Correct AnswerverifiedShow Answer

What structure best represents a polymer?

Correct AnswerverifiedShow Answer

The sole function of carbohydrates is to serve as energy stores.

Correct AnswerverifiedShow Answer

The functional group that forms a covalent bond between peptide chains and stabilizes protein tertiary structure is

Correct AnswerverifiedShow Answer

The substance most rich in unsaturated fats is

Correct AnswerverifiedE

Lipids and carbohydrates can both be used by animals to store energy.

Correct AnswerverifiedShow Answer

Macromolecules such as lipids and carbohydrates are produced from monomers through condensation reactions.

Correct AnswerverifiedShow Answer

The primary structure of a protein ultimately determines its three-dimensional structure.

Correct AnswerverifiedShow Answer

If sucrose is composed of both glucose and fructose,then sucrose must be a monosaccharide.

Correct AnswerverifiedShow Answer

The portion of an amino acid that makes it unique among the 20 different amino acids is its

Correct AnswerverifiedD

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B

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E

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D