Question 1

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

Accepted Answer

A separation technique in which an enzym...

Question 2

Which of the following is an L-amino acid?

Accepted Answer

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

Question 3

What peptide remains after two sequential Edman degradations of the pentapeptide Ser-Pro-Gly-Phe-Arg?

Accepted Answer

A)  Pro-Gly-Phe
B)  Ser-Pro-Gly
C)  Gly-Phe-Arg
D)  Pro-Gly
E)  Phe-ArgF) B) and E)
G) D) and E)

Question 4

Provide the major organic product(s)of the reaction below.

Accepted Answer

The answer of Provide the major organic product(s)of the reaction...

Question 5

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 D)
G) B) and D)

Question 6

Give the product for the following reaction.

Accepted Answer

A)  alanine
B)  leucine
C)  valine
D)  isoleucine
E)  glycineF) A) and E)
G) A) and C)

Question 7

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 8

Which of the following molecules is the skeletal structure of an amino acid?

Accepted Answer

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

Question 9

Which of the following amino acids has a side chain with an ionizable proton and can exist in four different forms,depending on the pH of the solution?

Accepted Answer

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

Question 10

Which of the following best describes the side chain of arginine at a pH of 11?

Accepted Answer

A)  hydrophobic
B)  nonpolar
C)  charged and polar
D)  uncharged but polar
E)  aproticF) A) and E)
G) A) and D)

Question 11

Give the product for the following reaction.

Accepted Answer

A)  alanine
B)  leucine
C)  valine
D)  isoleucine
E)  glycineF) B) and D)
G) B) and C)

Question 12

In conventional peptide synthesis,the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group is activated.Which of the following reagents is used to protect the amino group of an amino acid?

Accepted Answer

A)  di-tert-butyl dicarbonate
B)  dicyclohexylcarbodiimide
C)  ninhydrin
D)  trifluoroacetic acid
E)  phenylisothiocyanateF) C) and E)
G) B) and E)

Question 13

Give the product for the following reaction.

Accepted Answer

A)  alanine
B)  leucine
C)  valine
D)  isoleucine
E)  glycineF) D) and E)
G) C) and D)

Question 14

Which of the following amino acids has a sulfur in the R group?

Accepted Answer

A)  serine
B)  cysteine
C)  asparagine
D)  tyrosine
E)  leucineF) A) and E)
G) B) and D)

Question 15

Consider the two peptides shown below.Which of the following methods would be able to distinguish between these two sequences? Ala-Met-Val-Leu-Gly-Gly-Phe-Glu-Arg-Val
And
Ala-Val-Gly-Glu-Val-Met-Leu-Gly-Arg-Phe

Accepted Answer

A)  one cycle of Edman's reagent
B)  chymotrypsin digestion
C)  complete hydrolysis of all peptide bonds
D)  both A and B
E)  none of the aboveF) A) and C)
G) A) and E)

Question 16

The α-carbon of all the amino acids is a chirality center except for

Accepted Answer

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

Question 17

The conversion of thiols to disulfide represents a(n)

Accepted Answer

A)  oxidation.
B)  reduction.
C)  elimination.
D)  substitution.
E)  tautomerization.F) B) and E)
G) A) and E)

Question 18

Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro at pH 7.0.

Accepted Answer

The answer of Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro...

Question 19

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

Accepted Answer

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

Question 20

Which of the following amino acids has its isoelectric point at the lowest pH?

Accepted Answer

A)  glutamic acid
B)  lysine
C)  valine
D)  glycine
E)  methionineF) A) and E)
G) B) and E)

Exam 21: Amino Acids,peptides,and Proteins

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

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Give the product for the following reaction.

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In conventional peptide synthesis,the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group is activated.Which of the following reagents is used to protect the amino group of an amino acid?

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Which of the following amino acids has a side chain with an ionizable proton and can exist in four different forms,depending on the pH of the solution?

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Which of the following is an L-amino acid?

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The conversion of thiols to disulfide represents a(n)

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

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Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro at pH 7.0.

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

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Which of the following best describes the side chain of arginine at a pH of 11?

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Give the product for the following reaction.

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Consider the two peptides shown below.Which of the following methods would be able to distinguish between these two sequences? Ala-Met-Val-Leu-Gly-Gly-Phe-Glu-Arg-Val And Ala-Val-Gly-Glu-Val-Met-Leu-Gly-Arg-Phe

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Which of the following amino acids has its isoelectric point at the lowest pH?

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Provide the major organic product(s)of the reaction below.

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Which of the following molecules is the skeletal structure of an amino acid?

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Give the product for the following reaction.

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The α-carbon of all the amino acids is a chirality center except for

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Which of the following amino acids has a sulfur in the R group?

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

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

What peptide remains after two sequential Edman degradations of the pentapeptide Ser-Pro-Gly-Phe-Arg?

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A separation technique in which an enzym...
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