Ch.22 Carbohydrate Metabolism

McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition

McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo

McMurry 8th Edition

Ch.22 Carbohydrate Metabolism

Problema 4

Capitolo 22, Problema 4

Identify each step in glycolysis that is an isomerization.

Guida verificata passo dopo passo

Step 1: Understand the concept of isomerization. Isomerization is a chemical reaction where a molecule is transformed into another molecule with the same molecular formula but a different structural arrangement. In glycolysis, this involves the rearrangement of atoms within a molecule without adding or removing atoms.

Step 2: Recall the steps of glycolysis. Glycolysis is a 10-step metabolic pathway that converts glucose into pyruvate, producing ATP and NADH in the process. Each step is catalyzed by a specific enzyme.

Step 3: Identify the isomerization steps in glycolysis. The first isomerization occurs in Step 2, where glucose-6-phosphate is converted into fructose-6-phosphate. This reaction is catalyzed by the enzyme phosphoglucose isomerase.

Step 4: Identify the second isomerization step. The second isomerization occurs in Step 5, where dihydroxyacetone phosphate (DHAP) is converted into glyceraldehyde-3-phosphate (G3P). This reaction is catalyzed by the enzyme triose phosphate isomerase.

Step 5: Summarize the isomerization steps. In glycolysis, the isomerization reactions are Step 2 (glucose-6-phosphate to fructose-6-phosphate) and Step 5 (dihydroxyacetone phosphate to glyceraldehyde-3-phosphate). These steps involve structural rearrangements of the molecules to facilitate subsequent reactions in the pathway.

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Glycolysis

Glycolysis is a metabolic pathway that converts glucose into pyruvate, producing energy in the form of ATP and NADH. It consists of ten enzymatic reactions, which can be divided into two phases: the energy investment phase and the energy payoff phase. Understanding glycolysis is essential for identifying specific steps that involve isomerization, where molecules are rearranged to form isomers.

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Glycolysis Concept 5

Isomerization

Isomerization is a chemical process in which a molecule is transformed into another molecule with the same atoms but in a different arrangement. In glycolysis, isomerization reactions are crucial for facilitating the conversion of substrates into forms that can be further processed in subsequent steps. This rearrangement is vital for the efficient progression of the glycolytic pathway.

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Glycolysis Concept 5

Enzymatic Reactions in Glycolysis

Enzymatic reactions in glycolysis are catalyzed by specific enzymes that facilitate each step of the pathway. In the context of isomerization, two key enzymes are phosphoglucose isomerase, which converts glucose-6-phosphate to fructose-6-phosphate, and triose phosphate isomerase, which interconverts dihydroxyacetone phosphate and glyceraldehyde-3-phosphate. Recognizing these enzymatic steps is essential for identifying isomerization events in glycolysis.

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Glycolysis Concept 5

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Domanda del libro di testo

In alcoholic fermentation, each mole of pyruvate is converted to one mole of carbon dioxide and one mole of ethanol. In the process, about 50 kcal/mol (209 kJ/mol) of energy is produced. Under the most favorable conditions, more than one-half of this energy is stored as ATP.

a. What happens to the remaining energy produced in alcoholic fermentation?

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Domanda del libro di testo

Name the following pathways:

c. Pathway for synthesis of glucose from lactate

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Domanda del libro di testo

In Figure 22.3, compare the starting compound (glucose) and the final product (pyruvate).

a. Which is oxidized to a greater extent?

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Domanda del libro di testo

Use curved arrows (like those in Figure 22.3) to write an equation for the conversion of fructose to fructose 6-phosphate by ATP. At what step does fructose 6-phosphate enter glycolysis?

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