Exam 13: Carbohydrate Metabolism: Glycolysis, gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

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The conversion of phosphoenolpyruvate and ADP to pyruvate and ATP occurs in two distinct steps,first the transfer of the phosphate from PEP to ADP,then the conversion of enolpyruvate to pyruvate.Which of the following describes the reversibility of this process?

(Multiple Choice)

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Question 21

If a residue of glucose in glycogen is removed from the glycogen molecule and then allowed to proceed through glycolysis to pyruvate,what is the net production of ATP?

(Multiple Choice)

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Question 22

Which of the following enzymes is activated when acted on by phosphoprotein phosphatase 1?

(Multiple Choice)

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Question 23

During the oxidation of glyceraldehyde-3-phosphate,what intermediate in the enzyme-catalyzed mechanism actually undergoes oxidation?

(Multiple Choice)

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Question 24

Under conditions of strenuous exercise,gluconeogenesis occurs primarily in the _ using _ formed in the skeletal muscle

(Multiple Choice)

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Question 25

When lipid biosynthesis is active using carbohydrates as a source of carbon,three things are needed: NADPH,ATP and acetyl-CoA (from pyruvate).Which of the following best explains the operation of the pentose phosphate pathway (PPP)under such conditions? G6P = glucose-6-phosphate,F6P = fructose-6-phosphate,G3P = glyceraldehyde-3-phosphate

(Multiple Choice)

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Question 26

The conversion of 3-phosphoglycerate to phosphoenolpyruvate requires two reactions.Which of the following correctly identifies the types of reactions in the proper order of glycolysis?

(Multiple Choice)

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Question 27

Which isoform of hexokinase is found in the vertebrate liver?

(Multiple Choice)

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Question 28

Besides its role in glycogen synthesis,which of the following directly relies on UDP-glucose?

(Multiple Choice)

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Question 29

Besides two molecules of pyruvate,what are the net products of glycolysis?

(Multiple Choice)

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Question 30

Which of the following pairs of phosphorylated molecules contains an intermediate of glycolysis with high phosphate transfer potential and one with low phosphate transfer potential?

(Multiple Choice)

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Question 31

During the energy investment phase of glycolysis,_ reaction(s)use ATP as a substrate while during the energy generation phase,_ reactions produce ATP as a product.

(Multiple Choice)

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Question 32

If unregulated,which of the following pairs of enzymes would represent a futile cycle?

(Multiple Choice)

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Question 33

What sequence of enzymes allows for the synthesis of glycogen from glucose-6-phosphate?

(Multiple Choice)

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Question 34

With respect to carbons 1 and 2 of the intermediate in the conversion of glucose-6-phosphate to fructose-6-phosphate,which of the following would best describe this intermediate?

(Multiple Choice)

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Question 35

Which of the following glycolytic reactions is freely reversible?

(Multiple Choice)

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Question 36

A transketolase enzyme transfers a _ carbon fragment from a(n) to a(n)____.

(Multiple Choice)

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Question 37

Which of the following enzymes is used by the gluconeogenic pathway but not the glycolytic pathway?

(Multiple Choice)

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Question 38

Which of the following activators is correctly paired with the glycolytic or gluconeogenic enzyme that it activates?

(Multiple Choice)

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Question 39

Which enzyme catalyzes the primary regulation site of glycolysis?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 40

Exam 13: Carbohydrate Metabolism: Glycolysis, gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

The conversion of phosphoenolpyruvate and ADP to pyruvate and ATP occurs in two distinct steps,first the transfer of the phosphate from PEP to ADP,then the conversion of enolpyruvate to pyruvate.Which of the following describes the reversibility of this process?

If a residue of glucose in glycogen is removed from the glycogen molecule and then allowed to proceed through glycolysis to pyruvate,what is the net production of ATP?

Which of the following enzymes is activated when acted on by phosphoprotein phosphatase 1?

During the oxidation of glyceraldehyde-3-phosphate,what intermediate in the enzyme-catalyzed mechanism actually undergoes oxidation?

Under conditions of strenuous exercise,gluconeogenesis occurs primarily in the _______ using _______ formed in the skeletal muscle

The conversion of 3-phosphoglycerate to phosphoenolpyruvate requires two reactions.Which of the following correctly identifies the types of reactions in the proper order of glycolysis?

Which isoform of hexokinase is found in the vertebrate liver?

Besides its role in glycogen synthesis,which of the following directly relies on UDP-glucose?

Besides two molecules of pyruvate,what are the net products of glycolysis?

Which of the following pairs of phosphorylated molecules contains an intermediate of glycolysis with high phosphate transfer potential and one with low phosphate transfer potential?

During the energy investment phase of glycolysis,_____ reaction(s)use ATP as a substrate while during the energy generation phase,_____ reactions produce ATP as a product.

If unregulated,which of the following pairs of enzymes would represent a futile cycle?

What sequence of enzymes allows for the synthesis of glycogen from glucose-6-phosphate?

With respect to carbons 1 and 2 of the intermediate in the conversion of glucose-6-phosphate to fructose-6-phosphate,which of the following would best describe this intermediate?

Which of the following glycolytic reactions is freely reversible?

A transketolase enzyme transfers a _____ carbon fragment from a(n)________ to a(n)________.

Which of the following enzymes is used by the gluconeogenic pathway but not the glycolytic pathway?

Which of the following activators is correctly paired with the glycolytic or gluconeogenic enzyme that it activates?

Which enzyme catalyzes the primary regulation site of glycolysis?

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars,saccharides,glycans

Lipids,membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids,triacylglycerols,and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, steroids, isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, utilization, and Turnover

Metabolism of Nitogenous Compounds Ii: Amino Acids, porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes,genomes and Chromosomes

Dna Replication

Dna Restructuring: Repair,recombination,rearrangement,amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

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Under conditions of strenuous exercise,gluconeogenesis occurs primarily in the _ using _ formed in the skeletal muscle

During the energy investment phase of glycolysis,_ reaction(s)use ATP as a substrate while during the energy generation phase,_ reactions produce ATP as a product.

A transketolase enzyme transfers a _ carbon fragment from a(n) to a(n)____.