Question 1

Separation of amino acids using electrophoresis is mainly based on ______.

Accepted Answer

A)   differences in the pI values
B)   concentration
C)   differences in pH values
D)   none of these

Question 2

α\alphaα -Keratin found in hair, nails, and feathers is classified as ______.

Accepted Answer

A)   globular protein
B)   fibrous protein
C)   structural protein
D)   B & C
E)   none of these

Question 3

Provide the structure of the amino acid produced from the following reaction.

Accepted Answer

The answer of Provide the structure of the amino acid...

Question 4

Proteins found in humans have all amino acids with ____configuration.

Accepted Answer

A)   D
B)   L
C)   meso
D)   A & B
E)   none of these

Question 5

The quaternary structure of a protein is due to:

Accepted Answer

A)   hydrogen bonding within the peptide
B)   aggregation of two or more polypeptides
C)   disulfide linkages within the peptide
D)   all of these

Question 6

Draw the Fischer projection for L-aspartic acid and assign the configuration (R/S) at the chirality center.

Accepted Answer

The answer of Draw the Fischer projection for L-aspartic acid...

Question 7

Which of the following dipeptides is/are formed when alanine and valine are reacted in the presence of dicyclohexylcarbodiimide (DCC) ?

Accepted Answer

A)   Ala-Val
B)   Val-Ala
C)   Ala-Ala
D)   Val-Val
E)   all of these

Question 8

Provide the steps necessary to prepare the tetrapeptide Thr-Val-Ile-Met using the Merrifield synthesis.

Accepted Answer

The answer of Provide the steps necessary to prepare the...

Question 9

Which amino acid is produced from the following reaction?

Accepted Answer

A)   methionine
B)   serine
C)   cysteine
D)   lysine
E)   none of these

Question 10

When thirty amino acids are connected to each other, they form ____________.

Accepted Answer

A)   a tripeptide
B)   a protein
C)   a polypeptide
D)   a tetrapeptide
E)   none of these

Question 11

Which of the following is the predominant form of lysine at pH 14?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   V

Question 12

How will you prepare glycine staring with ethanol and using a Hell-Volhard-Zelinski reaction?

Accepted Answer

The answer of How will you prepare glycine staring with...

Question 13

Provide the reagents necessary to synthesize the following amino acid via the amidomalonate synthesis.

Accepted Answer

The answer of Provide the reagents necessary to synthesize the...

Question 14

Amino acids are considered amphoteric because _____________.

Accepted Answer

A)   they only react with acids
B)   they only react with bases
C)   they react with both acids and bases
D)   they do not react with acids or bases
E)   none of these

Question 15

Which of the following naturally occurring amino acids does not have the S configuration?

Accepted Answer

A)   alanine
B)   cysteine
C)   tyrosine
D)   isoleucine
E)   none of these

Question 16

Provide the structure of the amino acid produced from the following reaction sequence.

Accepted Answer

The answer of Provide the structure of the amino acid...

Question 17

Provide the structure of the amino acid produced from the following reaction.

Accepted Answer

The answer of Provide the structure of the amino acid...

Question 18

Which of the following amino acids have an acidic side chain?

Accepted Answer

A)   I & III
B)   I, II & III
C)   IV & V
D)   II, IV & V
E)   all of these

Question 19

The s-trans conformation of a peptide bond is more stable than the s-cis conformation because:

Accepted Answer

A)   there is a restricted rotation around the peptide bond
B)   rotation is allowed around the peptide bond
C)   it has reduced steric hindrance
D)   none of these

Question 20

Which of the following amino acids have a pI around pH 3?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   V

Exam 25: Amino Acids, Peptides, and Proteins

α\alphaα -Keratin found in hair, nails, and feathers is classified as ______.

Correct AnswerverifiedShow Answer

Which of the following amino acids have a pI around pH 3?

Correct AnswerverifiedShow Answer

Provide the reagents necessary to synthesize the following amino acid via the amidomalonate synthesis.

Correct AnswerverifiedShow Answer

Provide the steps necessary to prepare the tetrapeptide Thr-Val-Ile-Met using the Merrifield synthesis.

Correct AnswerverifiedShow Answer

Proteins found in humans have all amino acids with ____configuration.

Correct AnswerverifiedShow Answer

The s-trans conformation of a peptide bond is more stable than the s-cis conformation because:

Correct AnswerverifiedShow Answer

The quaternary structure of a protein is due to:

Correct AnswerverifiedShow Answer

How will you prepare glycine staring with ethanol and using a Hell-Volhard-Zelinski reaction?

Correct AnswerverifiedShow Answer

Which of the following amino acids have an acidic side chain?

Correct AnswerverifiedShow Answer

Which amino acid is produced from the following reaction?

Correct AnswerverifiedShow Answer

When thirty amino acids are connected to each other, they form ____________.

Correct AnswerverifiedShow Answer

Provide the structure of the amino acid produced from the following reaction.

Correct AnswerverifiedShow Answer

Amino acids are considered amphoteric because _____________.

Correct AnswerverifiedShow Answer

Provide the structure of the amino acid produced from the following reaction sequence.

Correct AnswerverifiedShow Answer

Draw the Fischer projection for L-aspartic acid and assign the configuration (R/S) at the chirality center.

Correct AnswerverifiedShow Answer

Separation of amino acids using electrophoresis is mainly based on ______.

Correct AnswerverifiedShow Answer

Which of the following dipeptides is/are formed when alanine and valine are reacted in the presence of dicyclohexylcarbodiimide (DCC) ?

Correct AnswerverifiedShow Answer

Which of the following is the predominant form of lysine at pH 14?

Correct AnswerverifiedShow Answer

Which of the following naturally occurring amino acids does not have the S configuration?

Correct AnswerverifiedShow Answer

Provide the structure of the amino acid produced from the following reaction.

Correct AnswerverifiedShow Answer

$\alpha$ -Keratin found in hair, nails, and feathers is classified as ______.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified