Question 1

Draw structures to represent what happens when lysine is dissolved in a strongly basic solution (pH=14).

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Question 2

Draw the structure of the phenylthiohydantoin product you would obtain by Edman degradation of these peptides.Show the configuration of the chirality center on the heterocycle.
a)H-Ile-Leu-Pro-Phe-OH
b)H-Asn-Thr-Ser-Gly-Ala-OH

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Question 3

The exact sequence of the different $\alpha$-amino acids along the protein chain is called the ___ of the protein.

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Question 4

Amino acids can be prepared from aldehydes by treatment with ammonia and HCN followed by hydrolysis.This method is known as the ___.

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Question 5

Give the structure of the aldehyde which,upon treatment with HCN and ammonia,followed by heating with aqueous acid,would afford racemic tryptophan.What is this strategy for the synthesis of $\alpha$-amino acids called?

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Question 6

Draw structures to represent what happens when lysine is dissolved in a strongly acidic solution (pH=0).

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Question 7

Peptide synthesis has four basic steps.These are: ___.

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Question 8

What are the name and the structure of the products A and B? Give the IUPAC for A and the trivial name for B.

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Question 9

Show the structures of the products obtained on reaction of valine with ninhydrin.

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Question 10

The most widely used method for identifying the N-terminal amino acid in a peptide chain is called the ___.

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Question 11

Calculate the pI of an amino acid with the following pK_as: pK_a1= 2.2; pK_a2= 9.3; pK_a3= 4.3.

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Question 12

C-Terminal amino acids can be identified through the use of ___.

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Question 13

What is the final product formed via the following reaction sequence? Give structural details of all significant intermediates.

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Question 14

Draw the structures of the following amino acids as they would appear in solution of pH = 3.
a)lysine,
b)glutamic acid,
c)alanine,
d)glycine.

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Question 15

What type of column chromatography packing is commonly used to separate amino acids by HPLC?

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Question 16

Complete the reaction presented below:

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Question 17

Show how a Strecker synthesis might be used to prepare phenylalanine starting from phenylacetaldehyde.

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Question 18

Draw structures to represent what happens when valine is dissolved in a strongly basic solution (pH=14).

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Question 19

A reagent that reacts with most amino acids to give an intense purple color is called ___.

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Question 20

What is the final product formed when potassium phthalimide is subjected to the following reaction sequence? Give structural details of all significant intermediates,including stereochemistry,as applicable.

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Quiz 24: Amino Acids and Proteins

Draw structures to represent what happens when lysine is dissolved in a strongly basic solution (pH=14).

Draw the structure of the phenylthiohydantoin product you would obtain by Edman degradation of these peptides.Show the configuration of the chirality center on the heterocycle. a)H-Ile-Leu-Pro-Phe-OH b)H-Asn-Thr-Ser-Gly-Ala-OH

The exact sequence of the different $\alpha$ -amino acids along the protein chain is called the ___ of the protein.

Amino acids can be prepared from aldehydes by treatment with ammonia and HCN followed by hydrolysis.This method is known as the ___.

Give the structure of the aldehyde which,upon treatment with HCN and ammonia,followed by heating with aqueous acid,would afford racemic tryptophan.What is this strategy for the synthesis of $\alpha$ -amino acids called?

Draw structures to represent what happens when lysine is dissolved in a strongly acidic solution (pH=0).

Peptide synthesis has four basic steps.These are: ___.

What are the name and the structure of the products A and B? Give the IUPAC for A and the trivial name for B.

Show the structures of the products obtained on reaction of valine with ninhydrin.

The most widely used method for identifying the N-terminal amino acid in a peptide chain is called the ___.

Calculate the pI of an amino acid with the following pK_as: pK_a1= 2.2; pK_a2= 9.3; pK_a3= 4.3.

C-Terminal amino acids can be identified through the use of ___.

What is the final product formed via the following reaction sequence? Give structural details of all significant intermediates.

Draw the structures of the following amino acids as they would appear in solution of pH = 3. a)lysine, b)glutamic acid, c)alanine, d)glycine.

What type of column chromatography packing is commonly used to separate amino acids by HPLC?

Complete the reaction presented below:

Show how a Strecker synthesis might be used to prepare phenylalanine starting from phenylacetaldehyde.

Draw structures to represent what happens when valine is dissolved in a strongly basic solution (pH=14).

A reagent that reacts with most amino acids to give an intense purple color is called ___.

What is the final product formed when potassium phthalimide is subjected to the following reaction sequence? Give structural details of all significant intermediates,including stereochemistry,as applicable.

Quiz 24: Amino Acids and Proteins

Draw structures to represent what happens when lysine is dissolved in a strongly basic solution (pH=14).

Draw the structure of the phenylthiohydantoin product you would obtain by Edman degradation of these peptides.Show the configuration of the chirality center on the heterocycle. a)H-Ile-Leu-Pro-Phe-OH b)H-Asn-Thr-Ser-Gly-Ala-OH

The exact sequence of the different α\alphaα -amino acids along the protein chain is called the ___ of the protein.

Amino acids can be prepared from aldehydes by treatment with ammonia and HCN followed by hydrolysis.This method is known as the ___.

Give the structure of the aldehyde which,upon treatment with HCN and ammonia,followed by heating with aqueous acid,would afford racemic tryptophan.What is this strategy for the synthesis of α\alphaα -amino acids called?

Draw structures to represent what happens when lysine is dissolved in a strongly acidic solution (pH=0).

Peptide synthesis has four basic steps.These are: ___.

What are the name and the structure of the products A and B? Give the IUPAC for A and the trivial name for B.

Show the structures of the products obtained on reaction of valine with ninhydrin.

The most widely used method for identifying the N-terminal amino acid in a peptide chain is called the ___.

Calculate the pI of an amino acid with the following pKas: pKa1 = 2.2; pKa2 = 9.3; pKa3 = 4.3.

C-Terminal amino acids can be identified through the use of ___.

What is the final product formed via the following reaction sequence? Give structural details of all significant intermediates.

Draw the structures of the following amino acids as they would appear in solution of pH = 3. a)lysine, b)glutamic acid, c)alanine, d)glycine.

What type of column chromatography packing is commonly used to separate amino acids by HPLC?

Complete the reaction presented below:

Show how a Strecker synthesis might be used to prepare phenylalanine starting from phenylacetaldehyde.

Draw structures to represent what happens when valine is dissolved in a strongly basic solution (pH=14).

A reagent that reacts with most amino acids to give an intense purple color is called ___.

What is the final product formed when potassium phthalimide is subjected to the following reaction sequence? Give structural details of all significant intermediates,including stereochemistry,as applicable.

The exact sequence of the different $\alpha$ -amino acids along the protein chain is called the ___ of the protein.

Give the structure of the aldehyde which,upon treatment with HCN and ammonia,followed by heating with aqueous acid,would afford racemic tryptophan.What is this strategy for the synthesis of $\alpha$ -amino acids called?

Calculate the pI of an amino acid with the following pK_as: pK_a1= 2.2; pK_a2= 9.3; pK_a3= 4.3.