Question 1

Double stranded DNA may be represented as a double helix with the two strands held together by

Accepted Answer

A) hydrogen bonds. 
B) covalent bonds. 
C) disulfide bonds. 
D) hydrophobic bonds. 
E) ionic bonds. 
A) hydrogen bonds. 
B) covalent bonds. 
C) disulfide bonds. 
D) hydrophobic bonds. 
E) ionic bonds. A

Question 2

The side chain on the amino acid tyrosine   is classified as

Accepted Answer

A) hydrophobic. 
B) nonpolar. 
C) a zwitterion. 
D) polar. 
E) asymmetric. 
A) hydrophobic. 
B) nonpolar. 
C) a zwitterion. 
D) polar. 
E) asymmetric. D

Question 3

Which of the following represents the linkage connecting amino acids in proteins?

Accepted Answer

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

Question 4

What is the type of polymer formed when 1,4-butanecarboxylic acid,HOOCCH2CH2COOH,reacts with 1,4-diaminobutane,H2NCH2CH2CH2CH2NH2?

Accepted Answer

A) polyacetylene 
B) polyolefin 
C) polystyrene 
D) polyester 
E) polyamide 
A) polyacetylene 
B) polyolefin 
C) polystyrene 
D) polyester 
E) polyamide

Question 5

What is the type of polymer formed when 1,5-pentanediol,HOCH2CH2CH2CH2CH2OH,reacts with 1,6-hexanedicarboxylic acid,HOOCCH2CH2CH2CH2COOH?

Accepted Answer

A) polyacetylene 
B) polyester 
C) polyamide 
D) polypropylene 
E) polyolefin 
A) polyacetylene 
B) polyester 
C) polyamide 
D) polypropylene 
E) polyolefin

Question 6

How many different tripeptides can be made from two molecules of the amino acid valine (val)and one molecule of the amino acid alanine (ala)?

Accepted Answer

A) 4 
B) 3 
C) 1 
D) 5 or more 
E) 2 
A) 4 
B) 3 
C) 1 
D) 5 or more 
E) 2

Question 7

The alpha helix and beta sheet are examples of

Accepted Answer

A) protein denaturation. 
B) protein primary structure. 
C) complementary bases. 
D) protein tertiary structure. 
E) protein secondary structure. 
A) protein denaturation. 
B) protein primary structure. 
C) complementary bases. 
D) protein tertiary structure. 
E) protein secondary structure.

Question 8

Which of the following units is not found in a DNA molecule?

Accepted Answer

A) a phosphate group 
B) a peptide bond 
C) an organic base 
D) a five-membered ring 
E) a ribose sugar 
A) a phosphate group 
B) a peptide bond 
C) an organic base 
D) a five-membered ring 
E) a ribose sugar

Question 9

Near a pH of 5.5,L-lysine (R = −(CH2)4NH2)the major species in aqueous solution is the diprotonated zwitterion.Given the following acid dissociation constants,what is the correct structure of the zwitterion?
Functional Group
Ka
Carboxylic acid
1)7 x10-2
Amine
8)5 x10-10
Side chain amine
1)51 x10-11

Accepted Answer

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

Question 10

Elimination of a small molecule such as water is involved in formation of which type of polymer?

Accepted Answer

A) condensation polymer 
B) addition polymer 
C) free-radical polymer 
D) homopolymer 
E) copolymer 
A) condensation polymer 
B) addition polymer 
C) free-radical polymer 
D) homopolymer 
E) copolymer

Question 11

The nucleic acid sequence that is complementary to the DNA sequence GAC TAC GTT AGC is

Accepted Answer

A) CTG ATG CAA TCG. 
B) GAC TAC GTT AGC. 
C) CGA TTG CAT CAG. 
D) TCA GCA TGG CTA. 
E) none of these 
A) CTG ATG CAA TCG. 
B) GAC TAC GTT AGC. 
C) CGA TTG CAT CAG. 
D) TCA GCA TGG CTA. 
E) none of these

Question 12

For the addition polymer polyacrylonitrile shown below,what is the chemical structure of the monomer?

Accepted Answer

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

Question 13

Polymers of amino-acid units are called

Accepted Answer

A) metabolites. 
B) nucleic acids. 
C) lipids. 
D) carbohydrates. 
E) proteins. 
A) metabolites. 
B) nucleic acids. 
C) lipids. 
D) carbohydrates. 
E) proteins.

Question 14

A hemiketal is formed from a(n)_____.

Accepted Answer

A) ​alcohol and an aldehyde 
B) ​ketone and an ether 
C) ​ketone and an alcohol 
D) ​alcohol and an ester 
E) ​ether and an ester 
A) ​alcohol and an aldehyde 
B) ​ketone and an ether 
C) ​ketone and an alcohol 
D) ​alcohol and an ester 
E) ​ether and an ester

Question 15

The structure of the polymer used in a freezer wrap can mainly be described as follows:
[CCl2 -CH2 -CCl2 -CH2 -CCl2 -CH2 -CCl2 -CH2]n
Which monomer could produce this polymer?

Accepted Answer

A) Cl2C - CH2 
B) CCl2 
C) CCl2 = CH2 
D) Cl2C = CH2 = CCl2 
E) none of these 
A) Cl2C - CH2 
B) CCl2 
C) CCl2 = CH2 
D) Cl2C = CH2 = CCl2 
E) none of these

Question 16

Which of the following 2'-deoxynucleotides contains the base thymine?

Accepted Answer

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

Question 17

Which of the following amino acids has a hydrophilic side chain?

Accepted Answer

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

Question 18

Which of the following is(are)not necessary for protein synthesis at the time and place where synthesis occurs?

Accepted Answer

A) ribosomes 
B) DNA 
C) mRNA 
D) amino acids 
E) tRNA 
A) ribosomes 
B) DNA 
C) mRNA 
D) amino acids 
E) tRNA

Question 19

What is the significance of a "stop codon"?

Accepted Answer

A) When it appears in messenger RNA,it is a signal to stop protein biosynthesis. 
B) When it appears in transfer RNA,it is a signal to stop transferring amino acids to the growing protein chain. 
C) When it appears in DNA,it is a signal to stop chromosome biosynthesis. 
D) When it appears in a protein,it is a signal for the protein to unfold. 
E) When it appears in ribosomal RNA,it is a signal to stop catalyzing protein biosynthesis. 
A) When it appears in messenger RNA,it is a signal to stop protein biosynthesis. 
B) When it appears in transfer RNA,it is a signal to stop transferring amino acids to the growing protein chain. 
C) When it appears in DNA,it is a signal to stop chromosome biosynthesis. 
D) When it appears in a protein,it is a signal for the protein to unfold. 
E) When it appears in ribosomal RNA,it is a signal to stop catalyzing protein biosynthesis.

Question 20

Which of the following is not an addition polymer?

Accepted Answer

A) poly(vinyl chloride) 
B) polyethylene 
C) polystyrene 
D) polypropylene 
E) polyester 
A) poly(vinyl chloride) 
B) polyethylene 
C) polystyrene 
D) polypropylene 
E) polyester

Exam 24: Polymer Materials: Synthetic and Biological

Double stranded DNA may be represented as a double helix with the two strands held together by

The side chain on the amino acid tyrosine is classified as

Which of the following represents the linkage connecting amino acids in proteins?

What is the type of polymer formed when 1,4-butanecarboxylic acid,HOOCCH2CH2COOH,reacts with 1,4-diaminobutane,H2NCH2CH2CH2CH2NH2?

What is the type of polymer formed when 1,5-pentanediol,HOCH2CH2CH2CH2CH2OH,reacts with 1,6-hexanedicarboxylic acid,HOOCCH2CH2CH2CH2COOH?

How many different tripeptides can be made from two molecules of the amino acid valine (val)and one molecule of the amino acid alanine (ala)?

The alpha helix and beta sheet are examples of

Which of the following units is not found in a DNA molecule?

Elimination of a small molecule such as water is involved in formation of which type of polymer?

The nucleic acid sequence that is complementary to the DNA sequence GAC TAC GTT AGC is

For the addition polymer polyacrylonitrile shown below,what is the chemical structure of the monomer?

Polymers of amino-acid units are called

A hemiketal is formed from a(n)_____.

The structure of the polymer used in a freezer wrap can mainly be described as follows: [CCl2 -CH2 -CCl2 -CH2 -CCl2 -CH2 -CCl2 -CH2]n Which monomer could produce this polymer?

Which of the following 2'-deoxynucleotides contains the base thymine?

Which of the following amino acids has a hydrophilic side chain?

Which of the following is(are)not necessary for protein synthesis at the time and place where synthesis occurs?

What is the significance of a "stop codon"?

Which of the following is not an addition polymer?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Filters

What is the type of polymer formed when 1,4-butanecarboxylic acid,HOOCCH₂CH₂COOH,reacts with 1,4-diaminobutane,H₂NCH₂CH₂CH₂CH₂NH₂?

What is the type of polymer formed when 1,5-pentanediol,HOCH₂CH₂CH₂CH₂CH₂OH,reacts with 1,6-hexanedicarboxylic acid,HOOCCH₂CH₂CH₂CH₂COOH?

The structure of the polymer used in a freezer wrap can mainly be described as follows: [CCl₂ -CH₂ -CCl₂ -CH₂ -CCl₂ -CH₂ -CCl₂ -CH₂]_n Which monomer could produce this polymer?