Exam 4: Amino Acids

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The picture below shows the structure of serotonin. a.From which amino acid is serotonin derived? b.What are the structural differences between serotonin and this amino acid? c.What is the function of serotonin? d.Which illness can be caused by reduced levels of serotonin in the brain?

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Question 41

the diagram below. -Residues 1 and 2 in the peptide shown above are connected through a

(Multiple Choice)

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Question 42

Matching -Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a ______.

(Multiple Choice)

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Question 43

The isoelectronic point of an amino acid is the point where

(Multiple Choice)

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Question 44

the diagram shown below. -What is the name of the N-terminal amino acid in the peptide shown above?

(Multiple Choice)

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Question 45

The pK₁, pK₂, and pK_R for the amino acid cysteine are 1.9, 10.7, and 8.4, respectively.At pH 5.0, cysteine would be charged predominantly as follows:

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Question 46

The pK₁, pK₂, and pK_R for the amino acid arginine are 1.8, 9.0, and 12.5, respectively.At pH 7.0 arginine would be charged predominantly as follows:

(Multiple Choice)

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Question 47

The tripeptide glycylarginylglutamate contains four ionizable groups with pK_as of 2.1, 4.1 9.8, and 12.5.Calculate the pI for this molecule.

(Multiple Choice)

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Question 48

Matching -At a pH below its pK_a, the $\beta$ -carboxylate group of Asp is ______.

(Multiple Choice)

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Question 49

Matching -In the tripeptide Trp─Val─Phe, the N-terminal residue is ______.

(Multiple Choice)

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Question 50

All the standard amino acids except ____ are optically active.

(Multiple Choice)

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Question 51

Which of the following tripeptides carries a net positive charge at pH 7.0?

(Multiple Choice)

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Question 52

The two peptides shown in the diagram below are linked through

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Question 53

In the early 1930's William Rose fed laboratory rats a mixture of all 19 amino acids known to be present in proteins.He observed that his rats lost weight.This observation led to the discovery of ______ as the 20th amino acid found in proteins.

(Multiple Choice)

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Question 54

Which of the five amino acids shown below has 2 chiral centers?

(Multiple Choice)

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Question 55

Matching -When a peptide bond is formed, an ______ reacts with a carboxylate group.

(Multiple Choice)

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Question 56

Tryptophan is an amino acid (pK_as are 2.5, and 9.4). a.How many different amino acids can be incorporated into proteins during translation? b.Give the three- and one-letter abbreviation for tryptophan. c.Draw the predominant structure of tryptophan at pH 7.0. d.Calculate the pI of Tryptophan.

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Question 57

Which amino acid does not have a primary $\alpha$ -amino group?

(Multiple Choice)

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Question 58

Which of the following statements is true?

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Question 59

About half of the 20 amino acids are called essential because

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Question 60

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Exam 4: Amino Acids

The picture below shows the structure of serotonin. a.From which amino acid is serotonin derived? b.What are the structural differences between serotonin and this amino acid? c.What is the function of serotonin? d.Which illness can be caused by reduced levels of serotonin in the brain?

the diagram below. -Residues 1 and 2 in the peptide shown above are connected through a

Matching -Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a ______.

The isoelectronic point of an amino acid is the point where

the diagram shown below. -What is the name of the N-terminal amino acid in the peptide shown above?

The pK1, pK2, and pKR for the amino acid cysteine are 1.9, 10.7, and 8.4, respectively.At pH 5.0, cysteine would be charged predominantly as follows:

The pK1, pK2, and pKR for the amino acid arginine are 1.8, 9.0, and 12.5, respectively.At pH 7.0 arginine would be charged predominantly as follows:

The tripeptide glycylarginylglutamate contains four ionizable groups with pKas of 2.1, 4.1 9.8, and 12.5.Calculate the pI for this molecule.

Matching -At a pH below its pKa, the β\betaβ -carboxylate group of Asp is ______.

Matching -In the tripeptide Trp─Val─Phe, the N-terminal residue is ______.

All the standard amino acids except ____ are optically active.

Which of the following tripeptides carries a net positive charge at pH 7.0?

The two peptides shown in the diagram below are linked through

In the early 1930's William Rose fed laboratory rats a mixture of all 19 amino acids known to be present in proteins.He observed that his rats lost weight.This observation led to the discovery of ______ as the 20th amino acid found in proteins.

Which of the five amino acids shown below has 2 chiral centers?

Matching -When a peptide bond is formed, an ______ reacts with a carboxylate group.

Tryptophan is an amino acid (pKas are 2.5, and 9.4). a.How many different amino acids can be incorporated into proteins during translation? b.Give the three- and one-letter abbreviation for tryptophan. c.Draw the predominant structure of tryptophan at pH 7.0. d.Calculate the pI of Tryptophan.

Which amino acid does not have a primary α\alphaα -amino group?

Which of the following statements is true?

About half of the 20 amino acids are called essential because

Introduction to the Chemistry of Life

Water

Nucleotides, Nucleic Acids, and Genetic Information

Proteins: Primary Structure

Proteins: Three-Dimensional Structure

Protein Function Part I: Myoglobin and Hemoglobin

Carbohydrates

Lipids and Biological Membranes

Membrane Transport

Enzyme Catalysis

Enzyme Kinetics, Inhibition and Control

Biochemical Signaling

Introduction to Metabolism

Glycogen Metabolism and Gluconeogenesis

Glucose Catabolism

Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Mammalian Fuel Metabolism: Integration and Regulation

Nucleotide Metabolism

Nucleic Acid Structure

Dna Replication, Repair and Recombination

Transcription and Rna Processing

Translation

Regulation of Gene Expression

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The pK₁, pK₂, and pK_R for the amino acid cysteine are 1.9, 10.7, and 8.4, respectively.At pH 5.0, cysteine would be charged predominantly as follows:

The pK₁, pK₂, and pK_R for the amino acid arginine are 1.8, 9.0, and 12.5, respectively.At pH 7.0 arginine would be charged predominantly as follows:

The tripeptide glycylarginylglutamate contains four ionizable groups with pK_as of 2.1, 4.1 9.8, and 12.5.Calculate the pI for this molecule.

Matching -At a pH below its pK_a, the $\beta$ -carboxylate group of Asp is ______.

Tryptophan is an amino acid (pK_as are 2.5, and 9.4). a.How many different amino acids can be incorporated into proteins during translation? b.Give the three- and one-letter abbreviation for tryptophan. c.Draw the predominant structure of tryptophan at pH 7.0. d.Calculate the pI of Tryptophan.

Which amino acid does not have a primary $\alpha$ -amino group?