Question 1

Proteins occurring in the  β\betaβ -pleated sheet structure

Accepted Answer

A)  are relatively inelastic.
B)  never occur in nature.
C)  produce structurally weak materials.
D)  contain no peptide bonds.
E)  are not involved in hydrogen bonds. F) A) and B)
G) None of the above A

Question 2

Cysteine and methionine are unique among the twenty essential amino acids in that they

Accepted Answer

A)  are chiral.
B)  contain an aromatic ring.
C)  do not form dipolar ions.
D)  contain sulfur.
E)  cannot join with other amino acids to form peptides.F) C) and E)
G) C) and D)

Question 3

Which one of these molecules could not serve as a monomer for an addition polymer?

Accepted Answer

A)  ClCH=CH2
B)  H2C=CH-CN
C)  H2C=CH-C6H5
D)   2 
B)  H2C=CH-CN 
C)  H2C=CH-C6H5 
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   2 
B)  H2C=CH-CN 
C)  H2C=CH-C6H5 
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and B)
G) C) and E)

Question 4

A peptide bond (also called an amide bond) joins two amino acids together.What atoms are linked by this bond?

Accepted Answer

A)  C - O
B)  C - H
C)  C - N
D)  N - S
E)  S - CF) C) and D)
G) A) and E)

Question 5

Which of the structures below corresponds to the dipeptide cysteylananine? The parent amino acids are shown below.

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) C) and E)
G) B) and D)

Question 6

The functional group  found in proteins is called a (an)

Accepted Answer

A)  amide.
B)  carboxylic acid.
C)  amine.
D)  amino acid.
E)  dipeptide.F) A) and B)
G) D) and E)

Question 7

Hydrogen bonding, dispersion forces, ionic forces, and dipole-dipole forces all affect the structure of a protein?

Accepted Answer

A) True 
 B)False

Question 8

The primary structure of a protein refers to the unique amino acid sequence of the polypeptide chain.

Accepted Answer

A) True 
 B)False

Question 9

Acrylonitrile results from the polymerization of

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) None of the above
G) D) and E)

Question 10

Both DNA and RNA have double-helical structures.

Accepted Answer

A) True 
 B)False

Question 11

A protein that has been reversibly denatured has

Accepted Answer

A)  temporarily lost part or all of its secondary or tertiary structure.
B)  temporarily lost part or all of its primary structure.
C)  been genetically modified due to errors in the nucleotides in the parent DNA.
D)  temporarily lost its amino acid residues.
E)  temporarily lost the hydrogen bonding between nitrogenous bases.F) B) and D)
G) D) and E) A

Question 12

The secondary structure of a protein is the

Accepted Answer

A)  configuration of those parts of the chain stabilized by a regular pattern of covalent bonds between C and O groups of the backbone of the chain.
B)  configuration of those parts of the chain stabilized by a regular pattern of hydrogen bonds between CO and NH groups of the backbone of the chain.
C)  specific order of amino acids in the chain.
D)  overall three-dimensional structure of the molecule.
E)  overall arrangement of several polypeptide chains into one functional unit.F) A) and E)
G) D) and E)

Question 13

The only true hydrocarbon polymer found in nature is

Accepted Answer

A)  rubber
B)  nylon
C)  Tyvek
D)  polystyrene
E)  neopreneF) C) and E)
G) B) and D)

Question 14

The backbone of a strand of nucleic acid consists of

Accepted Answer

A)  phosphate units only.
B)  phosphate and sugar units.
C)  polyester.
D)  phosphate, sugar, and nitrogen base units.
E)  sugar units only.F) A) and D)
G) B) and C)

Question 15

Poly(vinyl chloride) results from the polymerization of

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) C) and E)
G) A) and B)

Question 16

The intermolecular force between bases on the opposite strands of DNA responsible for its double-helical structure is

Accepted Answer

A)  hydrogen bonding.
B)  dispersion force.
C)  covalent bonding.
D)  ionic force.
E)  dipole-dipole force.F) A) and C)
G) B) and C)

Question 17

Which of the structures below corresponds to the dipeptide alanylcysteine? The parent amino acids are shown below.

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) A) and B)
G) A) and C) B

Question 18

Phosphorus is an essential mineral element.It is an important atom in which one of the following?

Accepted Answer

A)  amino acids
B)  proteins
C)  polyethylene
D)  nylon
E)  DNAF) D) and E)
G) B) and C)

Question 19

The monomer used to prepare polyvinyl chloride (PVC)is CHCl=CHCl.

Accepted Answer

A) True 
 B)False

Question 20

Which one of these materials is a copolymer?

Accepted Answer

A)  Styrene-butadiene
B)  polyvinyl chloride
C)  polypropylene
D)  poly-cis-isoprene
E)  polyethyleneF) A) and B)
G) None of the above

Exam 25: Synthetic and Natural Organic Polymers

Proteins occurring in the β\betaβ -pleated sheet structure

Correct AnswerverifiedA

Cysteine and methionine are unique among the twenty essential amino acids in that they

Correct AnswerverifiedShow Answer

Which one of these molecules could not serve as a monomer for an addition polymer?

Correct AnswerverifiedShow Answer

A peptide bond (also called an amide bond) joins two amino acids together.What atoms are linked by this bond?

Correct AnswerverifiedShow Answer

Which of the structures below corresponds to the dipeptide cysteylananine? The parent amino acids are shown below.

Correct AnswerverifiedShow Answer

The functional group found in proteins is called a (an)

Correct AnswerverifiedShow Answer

Hydrogen bonding, dispersion forces, ionic forces, and dipole-dipole forces all affect the structure of a protein?

Correct AnswerverifiedShow Answer

The primary structure of a protein refers to the unique amino acid sequence of the polypeptide chain.

Correct AnswerverifiedShow Answer

Acrylonitrile results from the polymerization of

Correct AnswerverifiedShow Answer

Both DNA and RNA have double-helical structures.

Correct AnswerverifiedShow Answer

A protein that has been reversibly denatured has

Correct AnswerverifiedA

The secondary structure of a protein is the

Correct AnswerverifiedShow Answer

The only true hydrocarbon polymer found in nature is

Correct AnswerverifiedShow Answer

The backbone of a strand of nucleic acid consists of

Correct AnswerverifiedShow Answer

Poly(vinyl chloride) results from the polymerization of

Correct AnswerverifiedShow Answer

The intermolecular force between bases on the opposite strands of DNA responsible for its double-helical structure is

Correct AnswerverifiedShow Answer

Which of the structures below corresponds to the dipeptide alanylcysteine? The parent amino acids are shown below.

Correct AnswerverifiedB

Phosphorus is an essential mineral element.It is an important atom in which one of the following?

Correct AnswerverifiedShow Answer

The monomer used to prepare polyvinyl chloride (PVC)is CHCl=CHCl.

Correct AnswerverifiedShow Answer

Which one of these materials is a copolymer?

Correct AnswerverifiedShow Answer

Proteins occurring in the $\beta$ -pleated sheet structure

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A

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B

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