Question 1

Which of the following is a correct structure for L-valine?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) B) and C)
G) All of the above

Question 2

Which of the following is the predominant form of serine at physiological pH?

Accepted Answer

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

Question 3

Which of the following is the correct sequence of the tetrapeptide that is formed by the following reaction sequence?

Accepted Answer

A)   Cys-Ala-Phe-Ser
B)   Cys-Phe-Ala-Ser
C)   Ser-Ala-Phe-Cys
D)   Ser-Phe-Ala-Cys
E)   none of theseF) C) and E)
G) D) and E)

Question 4

Provide the structure of the predominant form of alanine at pH 2?

Accepted Answer

The answer of Provide the structure of the predominant form...

Question 5

Which of the following amino acids have a basic side chain?

Accepted Answer

A)   I & II
B)   I, II & IV
C)   III & V
D)   I, II, III & IV
E)   all of theseF) A) and D)
G) B) and C)

Question 6

Which of the following is the predominant form of asparagine at physiological pH?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) All of the above
G) A) and E)

Question 7

Which of the following amino acids will move the farthest when subjected to electrophoresis at pH 7?

Accepted Answer

A)   I
B)   II
C)   III
D)   II & III
E)   none of theseF) A) and B)
G) B) and D)

Question 8

Which of the following tripeptides is formed when alanine is treated with (Boc) 2O and proline is treated with benzyl alcohol/acid first and the resulting intermediates are reacted in the presence of DCC followed by treatment with aqueous NaOH. The dipeptide is then reacted with the benzyl ester of leucine in the presence of DCC followed by treatment with trifluoroacetic acid and then aqueous NaOH?

Accepted Answer

A)   Ala-Pro-Leu
B)   Pro-Ala-Leu
C)   Leu-Ala-Pro
D)   Pro-Leu-Ala
E)   all of theseF) B) and E)
G) All of the above

Question 9

Provide the structure of the predominant form of valine at pH 10?

Accepted Answer

The answer of Provide the structure of the predominant form...

Question 10

Which amino acid is produced from the following reaction sequence?

Accepted Answer

A)   alanine
B)   valine
C)   leucine
D)   isoleucine
E)   none of theseF) C) and D)
G) C) and E)

Question 11

Which of the following tripeptides is formed when serine is treated with (Boc) 2O and threonine is treated with benzyl alcohol/acid first and the resulting intermediates are reacted in the presence of DCC followed by treatment with aqueous NaOH. The dipeptide is then reacted with the benzyl ester of isoleucine in the presence of DCC followed by treatment with trifluoroacetic acid and then aqueous NaOH?

Accepted Answer

A)   Ser-Tyr-Ile
B)   Ser-Thr-Ile
C)   Ile-Ser-Thr
D)   Ile-Ser-Tyr
E)   none of theseF) C) and D)
G) A) and D)

Question 12

How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Accepted Answer

The answer of How will you prepare phenylalanine using a...

Question 13

When more than fifty 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 theseF) A) and B)
G) C) and D)

Question 14

Which of the following amino acids is achiral?

Accepted Answer

A)   alanine
B)   leucine
C)   glycine
D)   phenylalanine
E)   none of theseF) A) and E)
G) A) and D)

Question 15

The ______ of amino acids in a protein is referred to as its primary structure.

Accepted Answer

A)   twisting
B)   sequencing
C)   folding
D)   none of theseE) A) and B)
F) All of the above

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

The secondary structure of a protein is due to ________ between amino acid residues.

Accepted Answer

A)   hydrophobic interactions
B)   hydrogen bonding
C)   salt bridges
D)   disulfide linkage
E)   none of theseF) All of the above
G) A) and E)

Question 18

Provide a stepwise synthesis for the dipeptide Ser-Phe.

Accepted Answer

The answer of Provide a stepwise synthesis for the dipeptide...

Question 19

Which of the following amino acids will migrate towards the anode at pH 6?
Phenylalanine: pI = 5.5
Leucine: pI = 6

Accepted Answer

The answer of Which of the following amino acids will...

Question 20

Which of the following statements is(are)  true about  α\alphaα -amino acids?

Accepted Answer

A)   the amino and carboxylic acid groups are separated by one carbon atom
B)   the amino group is connected to a carbon atom that is  α\alphaα  to the carboxylic acid group
C)   the  α\alphaα  carbon can be a chirality center
D)   all of these E) B) and C)
F) A) and C)

Exam 25: Amino Acids, Peptides, and Proteins

The secondary structure of a protein is due to ________ between amino acid residues.

Correct Answer
verified

The ______ of amino acids in a protein is referred to as its primary structure.

Correct Answer
verified

Which of the following is the correct sequence of the tetrapeptide that is formed by the following reaction sequence?

Correct Answer
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How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Correct Answer
verified

Which of the following amino acids is achiral?

Correct Answer
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Correct Answer
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Which amino acid is produced from the following reaction sequence?

Correct Answer
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Which of the following statements is(are) true about $\alpha$ -amino acids?

Correct Answer
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Which of the following is the predominant form of serine at physiological pH?

Correct Answer
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Provide the structure of the predominant form of valine at pH 10?

Correct Answer
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Correct Answer
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Provide the structure of the predominant form of alanine at pH 2?

Correct Answer
verified

When more than fifty amino acids are connected to each other, they form _________.

Correct Answer
verified

Which of the following amino acids will migrate towards the anode at pH 6? Phenylalanine: pI = 5.5 Leucine: pI = 6

Correct Answer
verified

Which of the following is a correct structure for L-valine?

Correct Answer
verified

Provide a stepwise synthesis for the dipeptide Ser-Phe.

Correct Answer
verified

Which of the following amino acids have a basic side chain?

Correct Answer
verified

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

Correct Answer
verified

Which of the following amino acids will move the farthest when subjected to electrophoresis at pH 7?

Correct Answer
verified

Which of the following is the predominant form of asparagine at physiological pH?

Correct Answer
verified

Exam 25: Amino Acids, Peptides, and Proteins

The secondary structure of a protein is due to ________ between amino acid residues.

Correct AnswerverifiedShow Answer

The ______ of amino acids in a protein is referred to as its primary structure.

Correct AnswerverifiedShow Answer

Which of the following is the correct sequence of the tetrapeptide that is formed by the following reaction sequence?

Correct AnswerverifiedShow Answer

How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Correct AnswerverifiedShow Answer

Which of the following amino acids is achiral?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which amino acid is produced from the following reaction sequence?

Correct AnswerverifiedShow Answer

Which of the following statements is(are) true about α\alphaα -amino acids?

Correct AnswerverifiedShow Answer

Which of the following is the predominant form of serine at physiological pH?

Correct AnswerverifiedShow Answer

Provide the structure of the predominant form of valine at pH 10?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Provide the structure of the predominant form of alanine at pH 2?

Correct AnswerverifiedShow Answer

When more than fifty amino acids are connected to each other, they form _________.

Correct AnswerverifiedShow Answer

Which of the following amino acids will migrate towards the anode at pH 6? Phenylalanine: pI = 5.5 Leucine: pI = 6

Correct AnswerverifiedShow Answer

Which of the following is a correct structure for L-valine?

Correct AnswerverifiedShow Answer

Provide a stepwise synthesis for the dipeptide Ser-Phe.

Correct AnswerverifiedShow Answer

Which of the following amino acids have a basic side chain?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following amino acids will move the farthest when subjected to electrophoresis at pH 7?

Correct AnswerverifiedShow Answer

Which of the following is the predominant form of asparagine at physiological pH?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which of the following statements is(are) true about $\alpha$ -amino acids?

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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