Exam 29: Amino Acids and Proteins

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Give the order (1^st to last) in which the following amino acids would be eluted with a buffer of pH = 4 from a column containing a cationic-exchange resin (Dowex 50): Arg (pI = 10.8), Ser (pI = 5.7), Asp (pI = 2.8) and His (pI = 7.6).

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Question 1

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What are the only non-covalent bonds that stabilize the tertiary structure of a peptide?

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Question 2

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Which of the following correctly describes a peptide bond?

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Question 3

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Which is the correct structure for serine?

(Multiple Choice)

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Question 4

Which of the following amino acids is achiral?

(Multiple Choice)

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Question 5

Which of the following is (are) fibrous protein(s)?

(Multiple Choice)

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Question 6

Which of the following correctly describes the Merrifield synthesis?

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Question 7

Why is the s-trans form of an amide bond more stable?

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Question 8

What is the major organic product for the following reaction?

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Question 9

What is (are) the missing reagent(s) in the reaction below?

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Question 10

Which of the following is the major advantage of the Merrifield synthesis of peptides?

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Question 11

What amino acid is at the C-terminus of the following peptide?

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Question 12

Reaction of a polypeptide, composed of 12 amino acids, with carboxypeptidase A releases Met (C-terminal amino acid).The polypeptide undergoes partial hydrolysis to give 12 groups of peptides.Use the groups of overlapping amino acids to determine the proper sequence of this polypeptide. Note: Since these lists of peptides are separated by commas, they are not necessarily in the proper sequence. Ser, Lys, Trp-5. Met, Ala, Gly- 9. Lys, Ser Gly, His, Ala-6. Ser, Lys, Val -10. Glu, His, Val Glu, Val, Ser-7. Glu, His-11. Trp, Leu, Glu Leu, Glu, Ser-8. Leu, Lys, Trp-12. Ala, Met

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Question 13

Below is a proposed method for resolving a racemic mixture of (R)- and (S)-phenylalanine.Upon separation of the products, will this method produce (R)- or (S)-phenylalanine?

(Multiple Choice)

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Question 14

What are the basic steps in the Merrifield peptide synthesis?

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Question 15

Which of the following correctly describes a protein?

(Multiple Choice)

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Question 16

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

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Question 17

Why can glycine not be resolved into two enantiomers?

(Multiple Choice)

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Question 18

Which of the following is (are) globular protein(s)?

(Multiple Choice)

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Question 19

Which of the following is the structure of the amino acid lysine?

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Question 20

Showing 1 - 20 of 35

Exam 29: Amino Acids and Proteins

Give the order (1st to last) in which the following amino acids would be eluted with a buffer of pH = 4 from a column containing a cationic-exchange resin (Dowex 50): Arg (pI = 10.8), Ser (pI = 5.7), Asp (pI = 2.8) and His (pI = 7.6).

What are the only non-covalent bonds that stabilize the tertiary structure of a peptide?

Which of the following correctly describes a peptide bond?

Which is the correct structure for serine?

Which of the following amino acids is achiral?

Which of the following is (are) fibrous protein(s)?

Which of the following correctly describes the Merrifield synthesis?

Why is the s-trans form of an amide bond more stable?

What is the major organic product for the following reaction?

What is (are) the missing reagent(s) in the reaction below?

Which of the following is the major advantage of the Merrifield synthesis of peptides?

What amino acid is at the C-terminus of the following peptide?

Below is a proposed method for resolving a racemic mixture of (R)- and (S)-phenylalanine.Upon separation of the products, will this method produce (R)- or (S)-phenylalanine?

What are the basic steps in the Merrifield peptide synthesis?

Which of the following correctly describes a protein?

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

Why can glycine not be resolved into two enantiomers?

Which of the following is (are) globular protein(s)?

Which of the following is the structure of the amino acid lysine?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers, and Related Compounds

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Synthetic Polymers

Lipids

Filters

Give the order (1^st to last) in which the following amino acids would be eluted with a buffer of pH = 4 from a column containing a cationic-exchange resin (Dowex 50): Arg (pI = 10.8), Ser (pI = 5.7), Asp (pI = 2.8) and His (pI = 7.6).