Question 1

Which type of interaction is not directly involved in maintaining tertiary structure?

Accepted Answer

A)  disulfide bridges
B)  hydrogen bonding
C)  peptide bonds
D)  salt bridges
E)  hydrophobic interactions

Question 2

All of the following are conjugated proteins except

Accepted Answer

A)  cytochrome oxidase.
B)  low-density lipoproteins.
C)  myoglobin.
D)  collagen.
E)  casein.

Question 3

Illustrate the backbone of a protein using a planar unit from one Ca carbon to the next Ca.

Accepted Answer

The answer of Illustrate the backbone of a protein using...

Question 4

The side chains or R groups of amino acids can be classified into each of the following categories except

Accepted Answer

A)  polar.
B)  non-polar.
C)  basic.
D)  acidic.
E)  isoelectric.

Question 5

Which amino acid is classified as neutral and non-polar?

Accepted Answer

A)  aspartic acid
B)  histidine
C)  phenylalanine
D)  lysine
E)  tyrosine

Question 6

Which of the following amino acids contains an alcohol group?

Accepted Answer

A)  Phe
B)  Val
C)  Asp
D)  Thr
E)  Cys

Question 7

Match the following.
-native protein

Accepted Answer

A)  refers to R groups which form hydrogen bonds with water because of their polarity
B)  refers to R groups that do not interact readily with water because they are non-polar
C)  a protein that is usually insoluble in water,is very tough,and has a long shape
D)  a carbon atom bonded to four different groups and therefore able to form enantiomers
E)  a protein that produces amino acids and other biomolecules or inorganic substancesF) a protein with the tertiary structure in which it normally occurs in living systemsG) a protein that produces only amino acids upon hydrolysisH) a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shapeI) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral

Question 8

The beta-pleated sheet is an example of

Accepted Answer

A)  primary structure.
B)  secondary structure.
C)  tertiary structure.
D)  quaternary structure.
E)  none of the above

Question 9

An amino acid has the form shown at

Accepted Answer

A)  a pH of 7.0.
B)  any pH other than 7.0.
C)  a pH greater than its isoelectric point.
D)  its isoelectric point.
E)  a pH less than its isoelectric point.

Question 10

Draw the tripeptide as it would be found at pH = 7: ala-gly-phe

Accepted Answer

The answer of Draw the tripeptide as it would be...

Question 11

This question has four parts: 
A) For the amino acid shown above in zwitterion form,circle the carboxyl group,underline the amine group,label the alpha carbon,and draw a box around the R group.
B) Write the name and abbreviation of your amino acid.
C) Classify the amino acid as polar,non-polar,acidic,or basic.Explain the basis for your classification.
D)Draw the structure of the amino acid at a pH well below its isoelectric point and well above its isoelectric point.

Accepted Answer

Any amino acid may be drawn in.This ques...

Question 12

All of the following can be classified as biomolecules except

Accepted Answer

A)  carbohydrates.
B)  proteins.
C)  lipids.
D)  nucleic acids.
E)  All of the above are biomolecules.

Question 13

Match the following.
-globular protein

Accepted Answer

A)  refers to R groups which form hydrogen bonds with water because of their polarity
B)  refers to R groups that do not interact readily with water because they are non-polar
C)  a protein that is usually insoluble in water,is very tough,and has a long shape
D)  a carbon atom bonded to four different groups and therefore able to form enantiomers
E)  a protein that produces amino acids and other biomolecules or inorganic substancesF) a protein with the tertiary structure in which it normally occurs in living systemsG) a protein that produces only amino acids upon hydrolysisH) a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shapeI) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral

Question 14

Which structure represents a zwitterion?

Accepted Answer

A)  
B)  
C)  
D)  
E)

Question 15

Amino acids used in proteins generally are

Accepted Answer

A)  α-amino acids.
B)  l-amino acids.
C)  d-amino acids.
D)  All are correct.
E)  None are correct.

Question 16

By convention,the N-terminal end of a protein is usually placed on the ________ of a protein structure.

Accepted Answer

A)  right side
B)  left side
C)  center
D)  bottom
E)  top

Question 17

Insulin is an example of a(an)

Accepted Answer

A)  enzyme.
B)  structural protein.
C)  storage protein.
D)  transport protein.
E)  hormone.

Question 18

The isoelectric point of an amino acid is the pH

Accepted Answer

A)  at which it exists in the basic form.
B)  at which it exists in the acid form.
C)  at which it exists in the zwitterion form.
D)  equal to its pKa.
E)  equal to its pKb.

Question 19

The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

Accepted Answer

A)  amide
B)  carbonyl
C)  ester
D)  glycosidic
E)  hydrogen

Question 20

The two protein chains in insulin are held together by

Accepted Answer

A)  disulfide linkages.
B)  hydrophobic interactions.
C)  hydrogen bonds.
D)  salt bridges.
E)  all of the above

Exam 18: Amino Acids and Proteins

Amino acids used in proteins generally are

Correct Answer
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The beta-pleated sheet is an example of

Correct Answer
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Which amino acid is classified as neutral and non-polar?

Correct Answer
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The isoelectric point of an amino acid is the pH

Correct Answer
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Draw the tripeptide as it would be found at pH = 7: ala-gly-phe

Correct Answer
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All of the following are conjugated proteins except

Correct Answer
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The two protein chains in insulin are held together by

Correct Answer
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The side chains or R groups of amino acids can be classified into each of the following categories except

Correct Answer
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Which structure represents a zwitterion?

Correct Answer
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Illustrate the backbone of a protein using a planar unit from one Ca carbon to the next Ca.

Correct Answer
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All of the following can be classified as biomolecules except

Correct Answer
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Correct Answer
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Any amino acid may be drawn in.This ques...
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The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

Correct Answer
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Insulin is an example of a(an)

Correct Answer
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Which type of interaction is not directly involved in maintaining tertiary structure?

Correct Answer
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An amino acid has the form shown at

Correct Answer
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Match the following. -native protein

Correct Answer
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Which of the following amino acids contains an alcohol group?

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By convention,the N-terminal end of a protein is usually placed on the ________ of a protein structure.

Correct Answer
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Match the following. -globular protein

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Exam 18: Amino Acids and Proteins

Amino acids used in proteins generally are

Correct AnswerverifiedShow Answer

The beta-pleated sheet is an example of

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Which amino acid is classified as neutral and non-polar?

Correct AnswerverifiedShow Answer

The isoelectric point of an amino acid is the pH

Correct AnswerverifiedShow Answer

Draw the tripeptide as it would be found at pH = 7: ala-gly-phe

Correct AnswerverifiedShow Answer

All of the following are conjugated proteins except

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The two protein chains in insulin are held together by

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The side chains or R groups of amino acids can be classified into each of the following categories except

Correct AnswerverifiedShow Answer

Which structure represents a zwitterion?

Correct AnswerverifiedShow Answer

Illustrate the backbone of a protein using a planar unit from one Ca carbon to the next Ca.

Correct AnswerverifiedShow Answer

All of the following can be classified as biomolecules except

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Correct AnswerverifiedAny amino acid may be drawn in.This ques...View AnswerShow Answer

The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

Correct AnswerverifiedShow Answer

Insulin is an example of a(an)

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Which type of interaction is not directly involved in maintaining tertiary structure?

Correct AnswerverifiedShow Answer

An amino acid has the form shown at

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Match the following. -native protein

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Which of the following amino acids contains an alcohol group?

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By convention,the N-terminal end of a protein is usually placed on the ________ of a protein structure.

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Match the following. -globular protein

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Any amino acid may be drawn in.This ques...
View Answer

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