Question 1

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. 
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. A

Question 2

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) E 
A) A 
B) B 
C) C 
D) D 
E) E B

Question 3

Proteins occurring in the $\beta$-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. 
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. A

Question 4

Which one of these materials is a copolymer?

Accepted Answer

A) Styrene-butadiene 
B) polyvinyl chloride 
C) polypropylene 
D) poly-cis-isoprene 
E) polyethylene 
A) Styrene-butadiene 
B) polyvinyl chloride 
C) polypropylene 
D) poly-cis-isoprene 
E) polyethylene

Question 5

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

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Acrylonitrile results from the polymerization of

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 8

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. 
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.

Question 9

Poly(vinyl chloride)results from the polymerization of

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Both DNA and RNA have double-helical structures.

Accepted Answer

A) True 
 B)False

Question 12

The only true hydrocarbon polymer found in nature is

Accepted Answer

A) rubber 
B) nylon 
C) Tyvek 
D) polystyrene 
E) neoprene 
A) rubber 
B) nylon 
C) Tyvek 
D) polystyrene 
E) neoprene

Question 13

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

Question 14

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. 
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.

Question 15

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 - C 
A) C - O 
B) C - H 
C) C - N 
D) N - S 
E) S - C

Question 16

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) DNA 
A) amino acids 
B) proteins 
C) polyethylene 
D) nylon 
E) DNA

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

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

Question 19

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) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 20

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)    
E)    
A) ClCH=CH2 
B) H2C=CH-CN 
C) H2C=CH-C6H5 
D)    
E)

Exam 25: Synthetic and Natural Organic Polymers

A protein that has been reversibly denatured has

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

Proteins occurring in the β\betaβ -pleated sheet structure

Which one of these materials is a copolymer?

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

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

Acrylonitrile results from the polymerization of

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

Poly(vinyl chloride)results from the polymerization of

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

Both DNA and RNA have double-helical structures.

The only true hydrocarbon polymer found in nature is

The backbone of a strand of nucleic acid consists of

The secondary structure of a protein is the

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

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

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

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

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

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

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

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