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44110aHW4 - liver cells 3 Indicate whether each of the...

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BIOCHEMISTRY 441 Spring 2010 Instructor: David O. Peterson Homework 4 Due in class Mar 29 1. Glucose that enters a liver cell has at least two possible fates; it can proceed directly into glycolysis or be stored as glycogen. Compare the ATP that is generated if a glucose molecule goes directly into glycolysis versus a glucose that is first stored as glycogen and then later enters glycolysis. That is, what is the energetic cost of storing the glucose? Explain your answer. 2. Using a diagram and a brief paragraph, describe how glucagon increases the concentration of cAMP in
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Unformatted text preview: liver cells. 3. Indicate whether each of the following would be increased or decreased in response to an increase in [cAMP]. activity of PFK-1 activity of FBPase-1 activity of glycogen synthase activity of phosphorylase kinase concentration of β-D-fructose-2,6-bisphosphate 4. Draw the mechanism of the reaction catalyzed by UDP-glucose pyrophosphorylase. 5. Draw the mechanism of the reaction in the pentose-phosphate pathway catalyzed by transaldolase....
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