Question 1

A polypeptide has a high pI value. Suggest which amino acids might comprise it.

Accepted Answer

Amino acids with basic side ch...

Question 2

Which of the following statements regarding cooperative binding is true?

Accepted Answer

A)   Two or more proteins aid the binding of a ligand.
B)   The binding of one ligand aids the binding of a second ligand
C)   The folding of part of a protein aids in the folding of the remainder of the protein
D)   All proteins engage in cooperative binding
E)   The binding of a cofactor to a protein aids in the binding of a ligand.F) B) and E)
G) A) and B)

Question 3

Which of the following amino acids lacks a center of asymmetry?

Accepted Answer

A)   Alanine
B)   Glycine
C)   Valine
D)   Isoleucine
E)   Aspartic acidF) None of the above
G) A) and E)

Question 4

What would be the products of the acid hydrolysis of the following decapeptide?
Gly-Phe-Tyr-Asn-Tyr-Met-Ser-His-Val-Leu

Accepted Answer

The products are glycine, phen...

Question 5

When part of a polypeptide chain, other than the N-terminus, which of the following amino acids can form an aldimine?

Accepted Answer

A)   Glycine
B)   Alanine
C)   Proline
D)   Histidine
E)   LysineF) B) and D)
G) B) and C)

Question 6

Of the naturally occurring amino acids Gly, Val, Phe, His, and Ser, which would be likely to form coordination compounds with metals when part of a peptide chain?

Accepted Answer

Glycine, valine, histidine and serine re...

Question 7

The Greek key is associated with which of the following?

Accepted Answer

A)   -helix
B)   Parallel -pleated sheets
C)   Antiparallel -pleated sheets
D)   Disulfide bridges
E)   Salt bridgesF) A) and C)
G) C) and E)

Question 8

A prosthetic group is a:

Accepted Answer

A)   Repair enzyme
B)   Group other than an amino acid that is part of a protein
C)   Group that generates the native form of a protein
D)   Disulfide link
E)   Group that reduces enzyme activityF) B) and E)
G) A) and B)

Question 9

The peptide bond is a stronger bond than that of esters. What structural feature of the peptide bond gives it additional bond strength?

Accepted Answer

The peptide bond is stronger than the es...

Question 10

A conjugated protein consists of a simple protein combined with a _________.

Accepted Answer

A)   Apoprotein
B)   Holoprotein
C)   Prosthetic group
D)   Answers B and C are correct
E)   All of the above are correctF) B) and C)
G) A) and D)

Question 11

Which of the following amino acids would be found in a -turn?

Accepted Answer

A)   Proline
B)   Alanine
C)   Phenylalanine
D)   Lysine
E)   TyrosineF) A) and D)
G) None of the above

Question 12

In what level of protein structure do disulfide bond occur?

Accepted Answer

Disulfide bonds are ...

Question 13

Given the following pKa's, the isoelectric point of serine is ________.
PK1 = 2.21 pK2 = 9.15 pKR = 13

Accepted Answer

A)   2.21
B)   5.68
C)   9.15
D)   6.62
E)   11.36F) None of the above
G) B) and E)

Question 14

Which of the following is not a function of IUPs?

Accepted Answer

A)   Signal transduction
B)   Transcription
C)   Translation
D)   Cell proliferation
E)   Oxygen transportF) None of the above
G) A) and B)

Question 15

Which of the following is a hydrophobic amino acid?

Accepted Answer

A)   Glycine
B)   Serine
C)   Lysine
D)   Phenylalanine
E)   Both C and D are hydrophobicF) A) and B)
G) B) and E)

Question 16

Fibrous proteins typically have large amounts of:

Accepted Answer

A)   -Helix
B)   -Pleated sheets
C)   Disulfide bridges
D)   Salt bridges
E)   Both A and B are correctF) B) and E)
G) C) and E)

Question 17

The overall three-dimensional structure of a polypeptide is referred to as _________ structure.

Accepted Answer

A)   Primary
B)   Secondary
C)   Tertiary
D)   Quaternary
E)   PeptideF) A) and B)
G) A) and D)

Question 18

Describe the term hormone. Give an example.

Accepted Answer

A hormone is a chemical signal...

Question 19

Consider the following tripeptide
Gly-Ala-Val
Glycine pKS1U1B11S1U1B0 = 2.34 pKS1U1B12S1U1B0 = 9.60 Alanine pKS1U1B11S1U1B0 = 2.34 pKS1U1B12S1U1B0 = 9.69
Valine pKS1U1B11S1U1B0 = 2.32 pKS1U1B12S1U1B0 = 9.62
-In which direction will the tripeptide move if placed in an electric field at pH 1, 5, 10, and 12

Accepted Answer

At pH's below the pI the pepti...

Question 20

How many octapeptides containing only two amino acids are possible?

Accepted Answer

A)   8
B)   148
C)   16
D)   256
E)   35F) B) and D)
G) B) and E)

Exam 5: Amino Acids, Peptides, and Proteins

Which of the following is not a function of IUPs?

Correct AnswerverifiedShow Answer

Which of the following amino acids lacks a center of asymmetry?

Correct AnswerverifiedShow Answer

Describe the term hormone. Give an example.

Correct AnswerverifiedA hormone is a chemical signal...View AnswerShow Answer

Which of the following amino acids would be found in a -turn?

Correct AnswerverifiedShow Answer

Which of the following is a hydrophobic amino acid?

Correct AnswerverifiedShow Answer

The Greek key is associated with which of the following?

Correct AnswerverifiedShow Answer

Consider the following tripeptide Gly-Ala-Val Glycine pK1 = 2.34 pK2 = 9.60 Alanine pK1 = 2.34 pK2 = 9.69 Valine pK1 = 2.32 pK2 = 9.62 -In which direction will the tripeptide move if placed in an electric field at pH 1, 5, 10, and 12

Correct AnswerverifiedAt pH's below the pI the pepti...View AnswerShow Answer

A polypeptide has a high pI value. Suggest which amino acids might comprise it.

Correct AnswerverifiedAmino acids with basic side ch...View AnswerShow Answer

A prosthetic group is a:

Correct AnswerverifiedShow Answer

Fibrous proteins typically have large amounts of:

Correct AnswerverifiedShow Answer

How many octapeptides containing only two amino acids are possible?

Correct AnswerverifiedShow Answer

Given the following pKa's, the isoelectric point of serine is ________. PK1 = 2.21 pK2 = 9.15 pKR = 13

Correct AnswerverifiedShow Answer

Which of the following statements regarding cooperative binding is true?

Correct AnswerverifiedShow Answer

In what level of protein structure do disulfide bond occur?

Correct AnswerverifiedDisulfide bonds are ...View AnswerShow Answer

The peptide bond is a stronger bond than that of esters. What structural feature of the peptide bond gives it additional bond strength?

Correct AnswerverifiedThe peptide bond is stronger than the es...View AnswerShow Answer

When part of a polypeptide chain, other than the N-terminus, which of the following amino acids can form an aldimine?

Correct AnswerverifiedShow Answer

What would be the products of the acid hydrolysis of the following decapeptide? Gly-Phe-Tyr-Asn-Tyr-Met-Ser-His-Val-Leu

Correct AnswerverifiedThe products are glycine, phen...View AnswerShow Answer

The overall three-dimensional structure of a polypeptide is referred to as _________ structure.

Correct AnswerverifiedShow Answer

A conjugated protein consists of a simple protein combined with a _________.

Correct AnswerverifiedShow Answer

Of the naturally occurring amino acids Gly, Val, Phe, His, and Ser, which would be likely to form coordination compounds with metals when part of a peptide chain?

Correct AnswerverifiedGlycine, valine, histidine and serine re...View AnswerShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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A hormone is a chemical signal...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Consider the following tripeptide Gly-Ala-Val Glycine pK₁ = 2.34 pK₂ = 9.60 Alanine pK₁ = 2.34 pK₂ = 9.69 Valine pK₁ = 2.32 pK₂ = 9.62 -In which direction will the tripeptide move if placed in an electric field at pH 1, 5, 10, and 12

Correct Answer
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At pH's below the pI the pepti...
View Answer

Correct Answer
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Amino acids with basic side ch...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Given the following pKa's, the isoelectric point of serine is ________. PK1 = 2.21 pK2 = 9.15 pK_R = 13

Correct Answer
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Correct Answer
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Correct Answer
verified
Disulfide bonds are ...
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Correct Answer
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The peptide bond is stronger than the es...
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Correct Answer
verified

Correct Answer
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The products are glycine, phen...
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Glycine, valine, histidine and serine re...
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