Question 1

A polypeptide has an amino acid sequence of: alanine-leucine-tryptophane-glycien-valine-alanine.
This chain of amino acids is further organized into a helix that in-turn, folds in and around itself to form a globular structure. The primary structure of this polypeptide is

Accepted Answer

A)   globular.
B)   pleated-sheet.
C)   alpha helix.
D)   alanine-leucine-tryptophane-glycien-valine-alanine.E) A) and C)
F) A) and B)

Question 2

Which of the following is NOT a protein function?

Accepted Answer

A)   support
B)   transportation
C)   defense
D)   motion
E)   insulationF) A) and B)
G) A) and C)

Question 3

The lipids of the cell membrane and the lipids found in butter and vegetable oil differ in which of the following?

Accepted Answer

A)   the number of fatty acids attached to the glycerol molecule
B)   the glycerol molecule
C)   the carbon to carbon bonds
D)   lipids of the cell membrane do not have hydrophobic sections of the moleculeE) None of the above
F) A) and D)

Question 4

Which of the following is a function of a steroid?

Accepted Answer

A)   sex hormone
B)   transmission of genetic information
C)   long term energy storage
D)   insulation against cold
E)   protective layerF) A) and D)
G) D) and E)

Question 5

A hydrocarbon is hydrophobic

Accepted Answer

A)   at all times.
B)   only in the living cell environment.
C)   except when it has an attached ionized functional group.
D)   in carbohydrates but not in lipids.E) A) and B)
F) A) and C)

Question 6

The alpha helix and beta sheet are found at which level of protein organization?

Accepted Answer

A)   primary structure
B)   secondary structure
C)   tertiary structure
D)   quaternary structureE) A) and B)
F) A) and C)

Question 7

Which of the following carbohydrates would NOT be a molecule used for energy storage?

Accepted Answer

A)   starch
B)   cellulose
C)   glycogen
D)   All of the above are used for energy storageE) A) and B)
F) All of the above

Question 8

A polysaccharide is a polymer made up of which kind of monomers?

Accepted Answer

A)   simple sugars
B)   amino acids
C)   nucleotides
D)   alternating sugar and phosphate groups
E)   fatty acids and glycerolF) A) and B)
G) D) and E)

Question 9

Which of the following protein structures is exemplified by globular proteins?

Accepted Answer

A)   tertiary
B)   secondary
C)   primary
D)   quaternary
E)   all of the protein structures are exemplified by globular proteinsF) A) and E)
G) A) and D)

Question 10

A dehydration reaction can also be called a (an)  _________ reaction since it forms water.

Accepted Answer

A)   condensation
B)   hydrolysis
C)   isomeric
D)   an energy-releasing
E)   monomer formationF) C) and D)
G) C) and E)

Question 11

Saturated fatty acids and unsaturated fatty acids differ in

Accepted Answer

A)   the number of carbon-to-carbon bonds.
B)   the consistency at room temperature.
C)   the number of hydrogen atoms present.
D)   all of the choices are differences between saturated and unsaturated fatty acid.E) C) and D)
F) All of the above

Question 12

Which statement below correctly describes why ATP is a high energy structure?

Accepted Answer

A)   ATP contains 2 phosphate bonds that contain high levels of energy.
B)   ATP contains hydro-carbon chains that hold energy.
C)   ATP is composed of thymine which is a high energy molecule.
D)   The last two phosphate bonds are unstable and easily broken.
E)   The first phosphate bond is unstable and easily broken.F) A) and B)
G) A) and C)

Question 13

Which of the following functional groups represents sulfhydryl?

Accepted Answer

A)   SH
B)   H-N-H
C)   OH
D)   0=C-OH
E)   C=OF) C) and E)
G) A) and B)

Question 14

If a segment of DNA has 20% adenine in its base composition, what percent thymine is there?

Accepted Answer

A)   20%
B)   80%
C)   60%
D)   30%E) B) and D)
F) B) and C)

Question 15

Starch is a protein that serves in energy storage in plant cells.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following structures is classified as a nucleic acid?

Accepted Answer

A)   adenine
B)   RNA
C)   thymine
D)   guanine
E)   cytosineF) C) and D)
G) None of the above

Question 17

A strand of DNA has the following base sequence (genetic code): ATTGCGAATGGCA. Construct the complementary strand of DNA.

Accepted Answer

Adenine and thymine and cytosine and guanine are complementary base pairs. The complementary strand has the sequence: TAACGCTTACCGT.

Question 18

What term is used for molecules that have identical molecular formulas but the atoms in each molecule are arranged differently?

Accepted Answer

A)   isotope
B)   isomer
C)   homomolecules
D)   organic
E)   balancedF) A) and D)
G) All of the above

Question 19

A lipid is a polymer made up of which kind of monomers?

Accepted Answer

A)   glucose or modified glucose molecules
B)   amino acids
C)   nucleotides
D)   alternating sugar and phosphate groups
E)   fatty acids and glycerolF) C) and E)
G) A) and E) E

Question 20

How many molecules of water are used to degrade this polypeptide, using hydrolysis reactions, into its constituent amino acids: alanine-leucine-tryptophane-glycine-valine-alanine?

Accepted Answer

A)   six
B)   five
C)   one
D)   sevenE) None of the above
F) A) and B) B

Exam 3: The Chemistry of Organic Molecules

A polypeptide has an amino acid sequence of: alanine-leucine-tryptophane-glycien-valine-alanine. This chain of amino acids is further organized into a helix that in-turn, folds in and around itself to form a globular structure. The primary structure of this polypeptide is

Correct AnswerverifiedShow Answer

Which of the following is NOT a protein function?

Correct AnswerverifiedShow Answer

The lipids of the cell membrane and the lipids found in butter and vegetable oil differ in which of the following?

Correct AnswerverifiedShow Answer

Which of the following is a function of a steroid?

Correct AnswerverifiedShow Answer

A hydrocarbon is hydrophobic

Correct AnswerverifiedShow Answer

The alpha helix and beta sheet are found at which level of protein organization?

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Which of the following carbohydrates would NOT be a molecule used for energy storage?

Correct AnswerverifiedShow Answer

A polysaccharide is a polymer made up of which kind of monomers?

Correct AnswerverifiedShow Answer

Which of the following protein structures is exemplified by globular proteins?

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A dehydration reaction can also be called a (an) _________ reaction since it forms water.

Correct AnswerverifiedShow Answer

Saturated fatty acids and unsaturated fatty acids differ in

Correct AnswerverifiedShow Answer

Which statement below correctly describes why ATP is a high energy structure?

Correct AnswerverifiedShow Answer

Which of the following functional groups represents sulfhydryl?

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If a segment of DNA has 20% adenine in its base composition, what percent thymine is there?

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Starch is a protein that serves in energy storage in plant cells.

Correct AnswerverifiedShow Answer

Which of the following structures is classified as a nucleic acid?

Correct AnswerverifiedShow Answer

A strand of DNA has the following base sequence (genetic code): ATTGCGAATGGCA. Construct the complementary strand of DNA.

Correct AnswerverifiedAdenine and thymine and cytosine and guanine are complementary base pairs. The complementary strand has the sequence: TAACGCTTACCGT.

What term is used for molecules that have identical molecular formulas but the atoms in each molecule are arranged differently?

Correct AnswerverifiedShow Answer

A lipid is a polymer made up of which kind of monomers?

Correct AnswerverifiedE

How many molecules of water are used to degrade this polypeptide, using hydrolysis reactions, into its constituent amino acids: alanine-leucine-tryptophane-glycine-valine-alanine?

Correct AnswerverifiedB

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Adenine and thymine and cytosine and guanine are complementary base pairs. The complementary strand has the sequence: TAACGCTTACCGT.

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E

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B