Answer the following to get a lot of point reversible interconversion reactions

Question

Answer the following to get a lot of point

reversible interconversion reactions of the pentose phosphate pathway can operate either to convert pentoses to hexoses (when operating in an oxidative mode to generate NADPH) or to convert hexoses to pentoses (when operating in a non-oxidative mode to generate pentoses for nucleic acid synthesis). Two key enzymes in these interconversion reactions are transaldolase and transketolase, and a key intermediate is the seven-carbon sugar sedoheptulose-7-phosphate. Identify the products formed from sedoheptulose-7-phosphate and glyceraldehyde-3-phosphate with each of these enzymes. The net equation for the oxidative reactions of the pentose phosphate pathway is Determine which of the following statements about the pentose phosphate pathway are true. Glucose is a precursor of the pentose phosphate pathway. NADP* is oxidized to NADPH in the pathway. Pentose phosphate pathway activity is high in rapidly dividing cells. Carbon atoms from the pentose sugar products may enter the glycolytic pathway. What is the of glucose-6-phosphate, glycolytic intermediates, and pentose phosphate pathway intermediates if the cell needs much more ribose 5-phosphate than NADPH? That is, the cell needs ribose 5-phosphate but has a relatively high concentration of NADPH and a low concentration of NADP*. (These conditions may occur in rapidly dividing cells.) Select all that apply. Three molecules of glyceraldehyde 3-phosphate and two molecules of fructose 6-phosphate are used to generate five molecules of ribose 5-phosphate. Most glucose 6-phosphate enters the glycolytic pathway and is converted to fructose 6-phospnate and glyceraldehyde 3-phospnate. Conversion of glycolytic intermediates to ribose 5-phosphate requires transketolase and transaldolase. Most glucose 6-phosphate enters the pentose phosphate pathway. The oxidative pentose phosphate pathway reaction catalyzed by glucose 6-phosphate dehydrogenase is slowed. Under the given conditions, all triose phosphates are converted to pyruvate by the glycolytic pathway. The path of carbon through glycolysis and gluconeogenesis is shown in the figure at the right. Answer the following two questions about the regulation of gluconeogenesis. which step of gluconeogenesis is the main negative control point? (Use the numbering system in the image at right.) Which of the following inhibit the enzyme in this step in the liver? Choose all that apply. glucose-6-phosphate fructose-2,6-bisphosphate AMP (or cAMP) acetyl-CoA insulin ATP glucose

Explanation / Answer

Answer to the first part.

Transaldolase products are erythrose-4-phosphate + F6P

Transketolase products are ribose-5-phosphate + xylulose-5-phosphate

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