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BIOC 431 Exam 3 F12

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Unformatted text preview: ar organelle called the glyoxysome. How do products of the glyoxylate shunt supply substrates for anabolic pathways that are in different subcellular compartments? You may include a diagram with legend in your answer. Succinate produced in the glyoxysome is exported to cytosol and then imported by the mitochondria where it can be converted to malate. Malate can then be exported to the cytosol where it is oxidized to oxaloacetate for use in gluconeogenesis. [9] Amino acid catabolism extracts energy from the oxidation of carbon but disposes of the amino group as ammonia. (a) Why is the disposal of ammonia an essential component of metabolism in carnivores but not in plants? (2 points) Carnivores obtain almost all their energy from the oxidation of the carbon skeletons of amino acids, hence the disposal of the ammonia group is critical. Plants obtain their energy from photosynthesis and do not generally degrade amino acids. Page | 6 (b) Ammonia can be released directly from only six different amino acids. i. Name three of them. (2 points) (one point for a correct amino acid, no deductions) Glutamate, Serine, Glycine, Glutamine, Aspar...
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