Question 1

Which of the following best represents the structure of an amino acid in basic solution (pH = 11) ?

Accepted Answer

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

Question 2

Which of the following structures can polypeptides have?

Accepted Answer

A)  primary structure
B)  secondary structure
C)  tertiary structure
D)  quaternary structure
E)  all of the aboveF) None of the above
G) A) and B)

Question 3

Which of the following amino acids will be closest to the origin when separated by thin-layer chromatography?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) D) and E)
G) A) and B)

Question 4

Which type of protein, globular or fibrous, tends to function primarily as structural parts of an organism?

Accepted Answer

The answer of Which type of protein, globular or fibrous,...

Question 5

The monomeric units that make up peptides and protein polymers are ________.

Accepted Answer

A)  nucleic acids
B)  amino acids
C)  oligosaccharides
D)  amylopectins
E)  cellulosesF) A) and C)
G) A) and B)

Question 6

Draw the form of L-tryptophan which is present at biological pH.

Accepted Answer

The answer of Draw the form of L-tryptophan which is...

Question 7

Which of the following protein structures does denaturation destroy?

Accepted Answer

A)  primary and secondary structures
B)  secondary and tertiary structures
C)  tertiary and quaternary structures
D)  secondary, tertiary, and quaternary structuresE) C) and D)
F) A) and B)

Question 8

Rate the following amino acids in decreasing order of migration towards the cathode (negative electrode)when separated by electrophoresis in a solution of pH= 7.3.
I. lysine: pI= 9.87
II. alanine: pI= 6.02
III. aspartate: pI= 5.95

Accepted Answer

The answer of Rate the following amino acids in decreasing...

Question 9

Draw and name the amino acids which may be described as heterocyclic.

Accepted Answer

The answer of Draw and name the amino acids which...

Question 10

Draw glutamate.

Accepted Answer

The answer of Draw glutamate....

Question 11

Draw the dipeptide Val-Tyr at pH 7.0.

Accepted Answer

The answer of Draw the dipeptide Val-Tyr at pH 7.0....

Question 12

Which of the following amino acids has the highest isoelectric point?

Accepted Answer

A)  arginine
B)  aspartic acid
C)  glycine
D)  proline
E)  phenylalanineF) D) and E)
G) B) and D)

Question 13

Describe what a β-pleated sheet is and explain the difference between parallel and anti-parallel β-pleated sheets.

Accepted Answer

A β-pleated sheet is a type of secondary...

Question 14

Explain what is meant by kinetic resolution and give an example.

Accepted Answer

A separation technique in which an enzym...

Question 15

What is electrophoresis?

Accepted Answer

A)  a technique that separates amino acids on the basis of their polarity
B)  a technique that separates amino acids on the basis of their solubility in water
C)  a technique that separates amino acids on the basis of their pI values
D)  a technique that separates amino acids on the basis of pKa of α-COOH values
E)  a technique that separates amino acids on the basis of pKa of α-+NH3 valuesF) None of the above
G) All of the above

Question 16

Draw the predominant form of aspartate at physiological pH.

Accepted Answer

The answer of Draw the predominant form of aspartate at...

Question 17

Draw vertical lines through the peptide bonds in the decapeptide below that will be cleaved by cyanogen bromide.
Try-Ser-Ala-Met-Ser-Pro-Met-Gly-Gly-Asp

Accepted Answer

The answer of Draw vertical lines through the peptide bonds...

Question 18

Which of the following amino acids has a heterocyclic R group?

Accepted Answer

A)  glycine
B)  threonine
C)  proline
D)  aspartic acid
E)  arginineF) B) and E)
G) B) and D)

Question 19

What is the product obtained from the mild oxidation of the thiol shown below? mild
2 R-SH

Accepted Answer

A)  R-S-R
B)  R-OH
C)  R-S-S-R
D)  R-OO-R
E)  R-S-OHF) B) and E)
G) A) and B)

Question 20

Provide the structure of Thr-Gln-Met at pH 7.0.

Accepted Answer

The answer of Provide the structure of Thr-Gln-Met at pH...

Exam 22: Amino Acids, Peptides, and Proteins

Draw vertical lines through the peptide bonds in the decapeptide below that will be cleaved by cyanogen bromide. Try-Ser-Ala-Met-Ser-Pro-Met-Gly-Gly-Asp

Correct AnswerverifiedShow Answer

What is electrophoresis?

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Rate the following amino acids in decreasing order of migration towards the cathode (negative electrode)when separated by electrophoresis in a solution of pH= 7.3. I. lysine: pI= 9.87 II. alanine: pI= 6.02 III. aspartate: pI= 5.95

Correct AnswerverifiedShow Answer

Which of the following protein structures does denaturation destroy?

Correct AnswerverifiedShow Answer

Which of the following amino acids has the highest isoelectric point?

Correct AnswerverifiedShow Answer

Which of the following best represents the structure of an amino acid in basic solution (pH = 11) ?

Correct AnswerverifiedShow Answer

What is the product obtained from the mild oxidation of the thiol shown below? mild 2 R-SH

Correct AnswerverifiedShow Answer

Draw and name the amino acids which may be described as heterocyclic.

Correct AnswerverifiedShow Answer

Which of the following amino acids has a heterocyclic R group?

Correct AnswerverifiedShow Answer

Draw the dipeptide Val-Tyr at pH 7.0.

Correct AnswerverifiedShow Answer

Explain what is meant by kinetic resolution and give an example.

Correct AnswerverifiedA separation technique in which an enzym...View AnswerShow Answer

Provide the structure of Thr-Gln-Met at pH 7.0.

Correct AnswerverifiedShow Answer

Which type of protein, globular or fibrous, tends to function primarily as structural parts of an organism?

Correct AnswerverifiedShow Answer

The monomeric units that make up peptides and protein polymers are ________.

Correct AnswerverifiedShow Answer

Which of the following structures can polypeptides have?

Correct AnswerverifiedShow Answer

Draw glutamate.

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Describe what a β-pleated sheet is and explain the difference between parallel and anti-parallel β-pleated sheets.

Correct AnswerverifiedA β-pleated sheet is a type of secondary...View AnswerShow Answer

Draw the form of L-tryptophan which is present at biological pH.

Correct AnswerverifiedShow Answer

Which of the following amino acids will be closest to the origin when separated by thin-layer chromatography?

Correct AnswerverifiedShow Answer

Draw the predominant form of aspartate at physiological pH.

Correct AnswerverifiedShow Answer

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A separation technique in which an enzym...
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A β-pleated sheet is a type of secondary...
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