Chapter 15: Q14P (page 521)
What is the advantage of activating pyruvate kinase with fructose-1, 6-bisphosphate?
Fructose-1,6-bisphosphate acts as a feed-forward for the pyruvate kinase.
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The pyruvate → lactate reaction in animals is reversible, but the pyruvate → ethanol fermentation in yeast is irreversible. Explain.
Some bacteria catabolize glucose by the Entner-Doudoroff pathway, a variant of glycolysis in which glucose-6-phosphate is convertedto 6-phosphogluconate (as in the pentose phosphate pathway) and thento 2-keto-3-deoxy-6-phosphogluconate (KDPG).
Next, an aldolase acts on KDPG. (a) Draw the structures of the products of the KDPG aldolase reaction. (b) Describe how these reaction products are further metabolized by glycolytic enzymes. (c) What isthe ATP yield when glucose is metabolized to pyruvate by the Entner-Doudoroff pathway? How does this compare to the ATP yield of glycolysis?
Consider the pathway for catabolizing galactose. What are the potential control points for this pathway?
The reversible reaction shown here is part of the Calvin cycle, a pathway in photosynthetic organisms. Which glycolytic reaction does this reaction resemble and what type of enzyme catalyzes it?
For enzymes a–e in Problem 35, identify their closest counterparts described in Chapter 15.
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