Question 1

An enzyme classified as a ligase would be associated with a reaction than involves the:

Accepted Answer

A) introduction of a double bond. 
B) loss of water. 
C) loss of carbon dioxide. 
D) transfer of an amino group. 
E) hydrolysis of an ester. 
A) introduction of a double bond. 
B) loss of water. 
C) loss of carbon dioxide. 
D) transfer of an amino group. 
E) hydrolysis of an ester. B

Question 2

Consider the following structure.Based on this structure answer the following question(s).

-Refer to instructions.Name the peptide using both the three-letter and one-letter codes.

Accepted Answer

Ser-Phe-Gly
S-F-G

Question 3

Which of the following amino acids would contain the highest concentration of zwitterions at pH 5.90?

Accepted Answer

A) aspartic acid (pI 2.77) 
B) alanine (pI 6.01) 
C) lysine (pI 9.74) 
D) glutamic acid (pI 3.22) 
E) all of these contain approximately equal concentrations of zwitterions 
A) aspartic acid (pI 2.77) 
B) alanine (pI 6.01) 
C) lysine (pI 9.74) 
D) glutamic acid (pI 3.22) 
E) all of these contain approximately equal concentrations of zwitterions B

Question 4

Which of the following amino acids migrates to the negative electrode on paper electrophoresis at a pH of 7.0?

Accepted Answer

A) lysine 
B) aspartic acid 
C) asparagine 
D) glutamic acid 
A) lysine 
B) aspartic acid 
C) asparagine 
D) glutamic acid

Question 5

Consider the following structure.Based on this structure answer the following question(s).
  
-Refer to instructions.Circle the peptide bonds.

Accepted Answer

The answer of Consider the following structure.Based on this structure...

Question 6

Refer to the data below to answer the following question(s).
Porcine dynorphin is a neuropeptide having 17 amino acid residues.Its structure is shown below.
Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln

-Refer to instructions.What fragments would result if dynorphin were cleaved by chymotropsin?

Accepted Answer

Chymotropsin catalyzes the hydrolysis of

Question 7

What are the R/S designations of the two stereocenters of L-threonine?

Accepted Answer

A) 2R,3R 
B) 2R,3S 
C) 2S,3R 
D) 2S,3S 
A) 2R,3R 
B) 2R,3S 
C) 2S,3R 
D) 2S,3S

Question 8

Which of the following amino acids is a secondary amine?

Accepted Answer

A) proline 
B) glutamine 
C) histidine 
D) aspargine 
A) proline 
B) glutamine 
C) histidine 
D) aspargine

Question 9

Which of the following dipeptides is L-Cys-L-Ala?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 10

Define isoelectric point.

Accepted Answer

The isoelectric point is the p

Question 11

Which of the following amino acids contains two stereocenters?

Accepted Answer

A) isoleucine 
B) proline 
C) phenylalanine 
D) glutamine 
A) isoleucine 
B) proline 
C) phenylalanine 
D) glutamine

Question 12

Refer to the data below to answer the following question(s).
Porcine dynorphin is a neuropeptide having 17 amino acid residues.Its structure is shown below.
Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln

-Refer to instructions.What fragments would result if dynorphin were cleaved by trypsin?

Accepted Answer

Trypsin catalyzes the hydrolys

Question 13

Which amino acid results from the following sequence of transformations?

Accepted Answer

leucine,i

Question 14

Instructions: Consider the following structure.Based on this structure answer the following question(s).  
Refer to instructions.How many other peptides could be formed from this same combination of amino acids?

Accepted Answer

A) 3 
B) 6 
C) 9 
D) 12 
A) 3 
B) 6 
C) 9 
D) 12

Question 15

Identify the aldehyde byproduct that results from the following reaction.

Accepted Answer

The answer of Identify the aldehyde byproduct that results from...

Question 16

To what structural feature does the term "quaternary structure" refer?

Accepted Answer

A) the sequence of amino acids in proteins 
B) the overall folding pattern of proteins 
C) the aggregation of polypeptides 
D) the conformation of local regions of polypeptides 
A) the sequence of amino acids in proteins 
B) the overall folding pattern of proteins 
C) the aggregation of polypeptides 
D) the conformation of local regions of polypeptides

Question 17

Draw and name the structure of the product of the following reaction.  tryptophan

Accepted Answer

The answer of Draw and name the structure of the...

Question 18

Which of the following amino acids has a non-polar side chain?

Accepted Answer

A) histidine 
B) arginine 
C) glutamine 
D) valine 
A) histidine 
B) arginine 
C) glutamine 
D) valine

Question 19

Which of the following amino acids has a sulfur-containing side chain?

Accepted Answer

A) serine 
B) cysteine 
C) lysine 
D) methionine 
E) both b and d 
A) serine 
B) cysteine 
C) lysine 
D) methionine 
E) both b and d

Question 20

To what structural feature does the term "tertiary structure" refer?

Accepted Answer

A) the sequence of amino acids in proteins 
B) the overall folding pattern of proteins 
C) the aggregation of polypeptides 
D) the conformation of local regions of polypeptides 
A) the sequence of amino acids in proteins 
B) the overall folding pattern of proteins 
C) the aggregation of polypeptides 
D) the conformation of local regions of polypeptides

Exam 19: Biomolecules: Amino Acids,peptides,and Proteins

An enzyme classified as a ligase would be associated with a reaction than involves the:

Consider the following structure.Based on this structure answer the following question(s). -Refer to instructions.Name the peptide using both the three-letter and one-letter codes.

Which of the following amino acids would contain the highest concentration of zwitterions at pH 5.90?

Which of the following amino acids migrates to the negative electrode on paper electrophoresis at a pH of 7.0?

Consider the following structure.Based on this structure answer the following question(s). -Refer to instructions.Circle the peptide bonds.

What are the R/S designations of the two stereocenters of L-threonine?

Which of the following amino acids is a secondary amine?

Which of the following dipeptides is L-Cys-L-Ala?

Define isoelectric point.

Which of the following amino acids contains two stereocenters?

Which amino acid results from the following sequence of transformations?

Instructions: Consider the following structure.Based on this structure answer the following question(s). Refer to instructions.How many other peptides could be formed from this same combination of amino acids?

Identify the aldehyde byproduct that results from the following reaction.

To what structural feature does the term "quaternary structure" refer?

Draw and name the structure of the product of the following reaction. tryptophan

Which of the following amino acids has a non-polar side chain?

Which of the following amino acids has a sulfur-containing side chain?

To what structural feature does the term "tertiary structure" refer?

Structure and Bonding

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Amino Acid Metabolism

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

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