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Questions and Answers
What is the precursor of methionine biosynthesis?
What is the precursor of methionine biosynthesis?
Which of the following amino acids is synthesized via the shikimate pathway?
Which of the following amino acids is synthesized via the shikimate pathway?
What is the origin of the GABA neurotransmitter?
What is the origin of the GABA neurotransmitter?
Which of the following is a conditionally essential amino acid?
Which of the following is a conditionally essential amino acid?
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What is the pI of the peptide Glu–His–Trp–Ser–Gly–Leu–Arg–Pro–Gly?
What is the pI of the peptide Glu–His–Trp–Ser–Gly–Leu–Arg–Pro–Gly?
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What is the EC number starting with for the enzyme catalyzing the reaction?
What is the EC number starting with for the enzyme catalyzing the reaction?
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What is the substrate for the synthesis of epinephrine and norepinephrine?
What is the substrate for the synthesis of epinephrine and norepinephrine?
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Which of the following amino acids is essential?
Which of the following amino acids is essential?
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Which of the following is a nonessential amino acid?
Which of the following is a nonessential amino acid?
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Which of the following amino acids is derived from aspartate?
Which of the following amino acids is derived from aspartate?
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Which of the following is a polar amino acid?
Which of the following is a polar amino acid?
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What are the precursors of urea in the liver?
What are the precursors of urea in the liver?
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What is the origin of the acetylcholine neurotransmitter?
What is the origin of the acetylcholine neurotransmitter?
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What is the enzyme that catalyzes the conversion of Asp to Asn?
What is the enzyme that catalyzes the conversion of Asp to Asn?
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Which of the following is a hormonal protein?
Which of the following is a hormonal protein?
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What is the origin of the carbon skeleton of serine?
What is the origin of the carbon skeleton of serine?
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At which point in the titration curve does glycine have its maximum buffering capacity?
At which point in the titration curve does glycine have its maximum buffering capacity?
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What is the net charge of glycine at point V in the titration curve?
What is the net charge of glycine at point V in the titration curve?
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Which amino acid is degraded to form ketone bodies or Krebs cycle intermediates?
Which amino acid is degraded to form ketone bodies or Krebs cycle intermediates?
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What is the precursor of proline amino acid?
What is the precursor of proline amino acid?
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Which enzyme catalyzes the reaction of glutamine synthesis?
Which enzyme catalyzes the reaction of glutamine synthesis?
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Which amino acid is the origin of serotonin neurotransmitter?
Which amino acid is the origin of serotonin neurotransmitter?
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What is the primary function of the enzyme GDH?
What is the primary function of the enzyme GDH?
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Which amino acid is a nonpolar amino acid?
Which amino acid is a nonpolar amino acid?
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What is the function of GOGAT enzyme?
What is the function of GOGAT enzyme?
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Which of the following is a storage protein?
Which of the following is a storage protein?
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What is the role of ion exchange chromatography in amino acid analysis?
What is the role of ion exchange chromatography in amino acid analysis?
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Which amino acid is a nonproteinogenic amino acid?
Which amino acid is a nonproteinogenic amino acid?
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What is the function of the enzyme GDH in plant cells?
What is the function of the enzyme GDH in plant cells?
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Which of the following is a contractile protein?
Which of the following is a contractile protein?
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Which amino acid will be eluted first from the cation-exchange column by a pH 7.0 buffer in the pair Asp and Lys?
Which amino acid will be eluted first from the cation-exchange column by a pH 7.0 buffer in the pair Asp and Lys?
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Which of the following amino acids is a polar uncharged amino acid?
Which of the following amino acids is a polar uncharged amino acid?
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Which enzyme is involved in the biosynthesis of dopamine from an amino acid?
Which enzyme is involved in the biosynthesis of dopamine from an amino acid?
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Which of the following is a nonpolar amino acid?
Which of the following is a nonpolar amino acid?
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What is the origin of the carbon skeleton of Leucine amino acid?
What is the origin of the carbon skeleton of Leucine amino acid?
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Which amino acid is the substrate for hydroxymethyl transferase to form Glyoxalate?
Which amino acid is the substrate for hydroxymethyl transferase to form Glyoxalate?
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Is Threonine biosynthesized in animals from aspartic acid?
Is Threonine biosynthesized in animals from aspartic acid?
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What is the likely cause of a patient with high blood ammonia levels, elevated glutamine and decreased arginine relative to normal levels?
What is the likely cause of a patient with high blood ammonia levels, elevated glutamine and decreased arginine relative to normal levels?
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Study Notes
Amino Acids
- Valine is a nonessential amino acid.
- Arginine is not a nonessential amino acid.
- Tyrosine is not a nonessential amino acid.
Amino Acid Metabolism
- Urea precursors in the liver are ammonia and aspartate.
- The enzyme that catalyzes the conversion of aspartate to asparagine has two substrates: glutamine and aspartate.
- ADP is an allosteric activator for the catabolic direction of glutamate dehydrogenase (GDH).
Amino Acid Structure and Function
- 6-N-Methyllysine is present in elastin.
- Serine is the origin of acetylcholine neurotransmitter.
- Histidine is converted to histamine by decarboxylation.
- Cysteine precursors are methionine and serine.
- The assimilation of nitrogen in plants in the dark is dependent on the enzyme glutamate dehydrogenase (GDH).
Hormonal Proteins
- Insulin is a hormonal protein.
- Epinephrine is a hormonal protein.
- Vasopressin is a hormonal protein.
Amino Acid Classification
- Aspartic acid is an acidic amino acid.
- Lysine is a basic amino acid.
- Glycine is an achiral amino acid.
- Leucine is a nonpolar amino acid.
Enzyme Reactions
- The enzyme that catalyzes the reaction of asparagine synthetase has an EC number starting with 6.
- The enzyme that catalyzes the conversion of glutamine to glutamate is glutamine synthetase.
Neurotransmitters
- GABA (gamma-aminobutyric acid) neurotransmitter is originated from glutamic acid.
- Serotonin neurotransmitter is originated from tryptophan.
- Dopamine neurotransmitter is originated from tyrosine.
- Epinephrine and norepinephrine synthesis originates from tryptophan.
Protein Structure and Function
- Collagen is a storage protein.
- Ovalbumin is a storage protein.
- Keratin is a contractile protein.
- Actin is a contractile protein.
- Myoglobin is a contractile protein.
Amino Acid Analysis
- Mixtures of amino acids can be analyzed by ion exchange chromatography.
- In a cation-exchange column, amino acids are separated based on ionic attraction and hydrophobic interactions.
Amino Acid Biosynthesis
- Leucine is biosynthesized from 3-phosphoglycerate.
- Proline is biosynthesized from glutamate.
- Serine is a substrate for hydroxymethyl transferase to form glycine.
- Threonine is biosynthesized from aspartic acid.
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Description
Quiz on classification and properties of amino acids, including essential and nonessential amino acids, polar and nonpolar amino acids, and their roles in biological processes.
