Question 1

In a quaternary structure, the nonpolar groups are attracted to each other with _________________.

Accepted Answer

A)   hydrogen bonding
B)   van der Waals interactions
C)   ion-dipole interactions
D)   dipole-dipole interactions
E)   covalent bondingF) A) and B)
G) A) and C)

Question 2

_______________ is a condition where the hemoglobin is distorted.

Accepted Answer

The answer of _______________ is a condition where the hemoglobin...

Question 3

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) C) and E)
G) B) and C)

Question 4

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 theseF) C) and E)
G) None of the above

Question 5

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 6

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 and C
E)   none of these F) A) and B)
G) A) and C)

Question 7

What is the pI of the following amino acid?

Accepted Answer

A)   2.76
B)   5.74
C)   6.62
D)   7.50
E)   none of theseF) D) and E)
G) A) and E)

Question 8

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

Accepted Answer

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

Question 9

Which of the following amino acids is the largest amino acid with a nonpolar side chain?

Accepted Answer

A)   tyrosine
B)   proline
C)   leucine
D)   tryptophan
E)   glycineF) C) and E)
G) B) and D)

Question 10

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

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">_TB4454_00...

Question 11

Which one of the following amino acid does not have an L-isomer?

Accepted Answer

A)   valine
B)   alanine
C)   leucine
D)   glycine
E)   none of theseF) None of the above
G) B) and C)

Question 12

Which of the following amino acids is not an essential amino acid?

Accepted Answer

A)   phenylalanine
B)   glycine
C)   isoleucine
D)   threonine
E)   valineF) A) and E)
G) A) and C)

Question 13

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

Accepted Answer

A)   twisting
B)   sequence
C)   folding
D)   bonding
E)   reactingF) C) and D)
G) D) and E)

Question 14

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 15

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

Accepted Answer

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

Question 16

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 17

Which of the following is a secondary structure of fibroin found in spider web and silk?

Accepted Answer

A)   ( β\betaβ -pleated sheets) 
B)   ( α\alphaα -pleated sheets) 
C)   ( α\alphaα -helix) 
D)   ( β\betaβ -helix) 
E)   none of these F) A) and B)
G) A) and E)

Question 18

Draw a bond-line structure for the tetrapeptide Ala-Ser-Cys-Phe.

Accepted Answer

The answer of Draw a bond-line structure for the tetrapeptide...

Question 19

Which of the following aldehydes would produce glycine using a Strecker synthesis?

Accepted Answer

A)   methanal
B)   ethanal
C)   propanal
D)   butanalE) A) and B)
F) A) and C)

Question 20

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) C) and E)
G) B) and E)

Exam 25: Amino Acids, Peptides, and Proteins

Draw a bond-line structure for the tetrapeptide Ala-Ser-Cys-Phe.

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

What is the pI of the following amino acid?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following aldehydes would produce glycine using a Strecker synthesis?

Correct AnswerverifiedShow Answer

Which of the following amino acids is not an essential amino acid?

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 asparagine at physiological pH?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following amino acids is the largest amino acid with a nonpolar side chain?

Correct AnswerverifiedShow Answer

Which of the following is a secondary structure of fibroin found in spider web and silk?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverified_TB4454_00...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

_______________ is a condition where the hemoglobin is distorted.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a quaternary structure, the nonpolar groups are attracted to each other with _________________.

Correct AnswerverifiedShow Answer

Which one of the following amino acid does not have an L-isomer?

Correct AnswerverifiedShow Answer

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

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_TB4454_00...
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