Chapter 16: Problem 4
Tetrahydrolipstatin (Orlistat) is a drug treatment for obesity. It is an inhibitor of pancreatic lipase. Suggest a rationale for use of tetrahydrolipstatin to treat obesity.
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Chapter 16: Problem 4
Tetrahydrolipstatin (Orlistat) is a drug treatment for obesity. It is an inhibitor of pancreatic lipase. Suggest a rationale for use of tetrahydrolipstatin to treat obesity.
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(a) Draw a general pathway for converting carbohydrates to fatty acids in a liver cell, and indicate which processes occur in the cytosol and which occur in mitochondria. (b) About half the reducing equivalents necessary for fatty acid synthesis are generated by glycolysis. Explain how these reducing equivalents can be used for fatty acid synthesis.
Where is the labeled carbon found when the following molecules are added to a liver homogenate carrying out palmitate synthesis? (a) \(\mathrm{H}^{14} \mathrm{CO}_{3}\) (b) \(\mathrm{O}\) \(\|\) \(\mathrm{H}_{3}{ }^{14} \mathrm{C}-\mathrm{C}-\mathrm{S}-\mathrm{CoA}\)
(a) Familial hypercholesterolemia is a human genetic disorder in which LDL receptors are defective, leading to very high blood cholesterol levels and severe atherosclerosis at an early age. Explain why this disease results in high blood cholesterol levels. (b) Do high blood cholesterol levels affect cellular cholesterol synthesis in individuals with this disease? (c) Individuals with Tangier's disease lack the cellular protein \(\mathrm{ABCl}\), which is required for cholesterol uptake by HDL. How will this disease affect cholesterol transport?
Excess dietary fat can be converted to cholesterol in the liver. When palmitate labeled with \({ }^{14} \mathrm{C}\) at every oddnumbered carbon is added to a liver homogenate, where does the label appear in mevalonate?
Animals cannot carry out a net conversion of even chain fatty acid carbons to glucose. On the other hand, some of the carbons in odd-chain fatty acids can be gluconeogenic precursors to glucose. Explain.
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