Exam 21: Amino Acid Metabolism

The activity of bacterial glutamine synthetase is (I)inhibited allosterically by tryptophan. (II)inhibited allosterically by glucosamine-6-phosphate. (III)activated by nine allosteric feedback inhibitors. (IV)altered by covalent modification.

(Multiple Choice)

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Question 21

Which of the following control the urea cycle? (I)substrate concentration of the cycle enzymes (II)allosteric activation of carbamoyl phosphate synthetase I (III)concentration of glutamate (IV)availability of glucose

(Multiple Choice)

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Question 22

Which of the following glycolytic intermediates is the common precursor to serine,cysteine,and glycine?

(Multiple Choice)

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Question 23

The presence of SGOT and SGPT in the serum indicate potential

(Multiple Choice)

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Question 24

Which of the following statements about phenylalanine is(are)TRUE?

(Multiple Choice)

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Question 25

A number of compounds,including neurotransmitters,are synthesized from amino acids via decarboxylations.The enzymes catalyzing these steps usually use _______ as a cofactor.

(Multiple Choice)

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Question 26

Matching Choose the correct answer from the list.Not all the answers will be used. -_____ are involved in the nonselective degradation of proteins in well nourished cells.

(Multiple Choice)

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Question 27

Ketogenic amino acids can be converted to (I)glucose (II)fatty acids (III)ketone bodies (IV)pyruvate

(Multiple Choice)

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Question 28

The metabolite chorismate

(Multiple Choice)

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Question 29

Which of the following is TRUE about glutamine? (I)It is formed from $\alpha$ -ketoglutarate. (II)It donates an amino group to aspartate to form asparagine. (III)It is directly required for ornithine synthesis. (IV)It is a precursor to homoserine.

(Multiple Choice)

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Question 30

Matching Choose the correct answer from the list.Not all the answers will be used. -The enzyme ______ is critical to regulating nitrogen metabolism.

(Multiple Choice)

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Question 31

Enzyme A is involved in the metabolism of metabolite C to metabolite D.Enzyme A is part of a linear pathway involving ten enzymes ultimately converting B $\to$ F.High levels of F directly alter the activity of enzyme A and result in control over the overall pathway.Enzyme A

(Multiple Choice)

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Question 32

Which of the following is(are)advantages to the constant degradation and reformation of proteins?

(Multiple Choice)

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Question 33

Proteins targeted for destruction via the ubiquitin pathway include (I)proteins with a destabilizing N-end rule component. (II)proteins with a PEST sequence. (III)proteins that contain the RING finger E3 component named E3a. (IV)protein with polyubiquitin proteins.

(Multiple Choice)

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Question 34

The amino acids Ala,Cys,Gly,Ser,and Thr are all degraded to the metabolic intermediate _ and are considered __.

(Multiple Choice)

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Question 35

The lifetime of a protein in cells actively involved in metabolism

(Multiple Choice)

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Question 36

Which of the following is TRUE regarding catabolism of leucine?

(Multiple Choice)

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Question 37

Oxidative deamination of glutamate (I)generates NAD(P)H and $\alpha$ -ketoglutarate. (II)is inhibited by glutamate. (III)is activated by GTP. (IV)eliminates the keto group from $\alpha$ -ketoacids.

(Multiple Choice)

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Question 38

Which of the following require a cyclic carbohydrate precursor for synthesis? (I)histidine (II)alanine (III)arginine (IV)tyrosine

(Multiple Choice)

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Question 39

Which of the following amino acid breakdown reactions would be catalyzed by an aminotransferase?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 50

Exam 21: Amino Acid Metabolism

The activity of bacterial glutamine synthetase is (I)inhibited allosterically by tryptophan. (II)inhibited allosterically by glucosamine-6-phosphate. (III)activated by nine allosteric feedback inhibitors. (IV)altered by covalent modification.

Which of the following control the urea cycle? (I)substrate concentration of the cycle enzymes (II)allosteric activation of carbamoyl phosphate synthetase I (III)concentration of glutamate (IV)availability of glucose

Which of the following glycolytic intermediates is the common precursor to serine,cysteine,and glycine?

The presence of SGOT and SGPT in the serum indicate potential

Which of the following statements about phenylalanine is(are)TRUE?

A number of compounds,including neurotransmitters,are synthesized from amino acids via decarboxylations.The enzymes catalyzing these steps usually use _______ as a cofactor.

Matching Choose the correct answer from the list.Not all the answers will be used. -_____ are involved in the nonselective degradation of proteins in well nourished cells.

Ketogenic amino acids can be converted to (I)glucose (II)fatty acids (III)ketone bodies (IV)pyruvate

The metabolite chorismate

Which of the following is TRUE about glutamine? (I)It is formed from α\alphaα -ketoglutarate. (II)It donates an amino group to aspartate to form asparagine. (III)It is directly required for ornithine synthesis. (IV)It is a precursor to homoserine.

Matching Choose the correct answer from the list.Not all the answers will be used. -The enzyme ______ is critical to regulating nitrogen metabolism.

Enzyme A is involved in the metabolism of metabolite C to metabolite D.Enzyme A is part of a linear pathway involving ten enzymes ultimately converting B →\to→ F.High levels of F directly alter the activity of enzyme A and result in control over the overall pathway.Enzyme A

Which of the following is(are)advantages to the constant degradation and reformation of proteins?

Proteins targeted for destruction via the ubiquitin pathway include (I)proteins with a destabilizing N-end rule component. (II)proteins with a PEST sequence. (III)proteins that contain the RING finger E3 component named E3a. (IV)protein with polyubiquitin proteins.

The amino acids Ala,Cys,Gly,Ser,and Thr are all degraded to the metabolic intermediate ___ and are considered ____.

The lifetime of a protein in cells actively involved in metabolism

Which of the following is TRUE regarding catabolism of leucine?

Oxidative deamination of glutamate (I)generates NAD(P)H and α\alphaα -ketoglutarate. (II)is inhibited by glutamate. (III)is activated by GTP. (IV)eliminates the keto group from α\alphaα -ketoacids.

Which of the following require a cyclic carbohydrate precursor for synthesis? (I)histidine (II)alanine (III)arginine (IV)tyrosine

Which of the following amino acid breakdown reactions would be catalyzed by an aminotransferase?

Introduction to the Chemistry of Life

Water

Nucleotides, nucleic Acids, and Genetic Information

Amino Acids

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

Glucose Catabolism

Glycogen Metabolism and Gluconeogenesis

Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Mammalian Fuel Metabolism: Integration and Regulation

Nucleotide Metabolism

Nucleic Acid Structure

DNA Replication, repair and Recombination

Transcription and Rna Processing

Protein Synthesis

Regulation of Gene Expression

Filters

Which of the following is TRUE about glutamine? (I)It is formed from $\alpha$ -ketoglutarate. (II)It donates an amino group to aspartate to form asparagine. (III)It is directly required for ornithine synthesis. (IV)It is a precursor to homoserine.

Enzyme A is involved in the metabolism of metabolite C to metabolite D.Enzyme A is part of a linear pathway involving ten enzymes ultimately converting B $\to$ F.High levels of F directly alter the activity of enzyme A and result in control over the overall pathway.Enzyme A

The amino acids Ala,Cys,Gly,Ser,and Thr are all degraded to the metabolic intermediate _ and are considered __.

Oxidative deamination of glutamate (I)generates NAD(P)H and $\alpha$ -ketoglutarate. (II)is inhibited by glutamate. (III)is activated by GTP. (IV)eliminates the keto group from $\alpha$ -ketoacids.