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PracticeExam5

A adenine b aspartate c creatine d glutamate e

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Unformatted text preview: a. Adenine. b. Aspartate. c. Creatine. d. Glutamate. e. Ornithine. 25. Conversion of ornithine to citrulline is a step in the synthesis of: a. aspartate. b. carnitine. c. pyruvate. d. tyrosine. e. urea. 26. Which of the following statements is false in reference to the mammalian synthesis of urea? a. Krebs was a major contributor to the elucidation of the pathway involved. b. The amino acid arginine is the immediate precursor to urea. 3 c. The carbon atom of urea is derived from mitochondrial HCO- d. The precursor to one of the nitrogens of urea is aspartate. e. The process of urea production is an energy-yielding series of reactions. 27. The human genetic disease phenylketonuria (PKU) can result from: a. deficiency of protein in the diet. b. inability to catabolize ketone bodies. c. inability to convert phenylalanine to tyrosine. d. inability to synthesize phenylalanine. e. production of enzymes containing no phenylalanine. 28. Which substance is not involved in the production of urea from NH4 via the urea cycle? + a. Aspartate. b. ATP. c. Carbamoyl phosphate. d. Malate. e. Ornithine. 29. Amino acid catabolism takes place in the: a. nucleus. b. microsomes. c. endoplasmic reticulum. d. cytoplasm. e. mitochonidria. 30. Urea synthesis in mammals takes place primarily in tissues of the: a. brain . b. kidney. c. liver. d. skeletal muscle. e. all of these. Written Answer Questions 1. For the average adult (70 kg or 154 lb), 15% of the body is fat. a. Calculate the energy reserve in terms of kJ. Assume 38 kJ/gram fat. (5points) b. Our 70 kg human consumes roughly 8,400 kJ/day (which is 2,000 kcal/day or 2,000 dietary cal/day). Clicker Question: How long could this person survive on their fat reserves? (5 points). 2. A new manufacturer of IV saline+glucose solutions got into trouble for mixing up the proportions of saline (normally 0.9% as NaCl ) and glucose (normally 5%). What was the actual glucose concentration in mM of this unfortunate IV product? The molecular weight of glucose is 180 Daltons. (10 points). 3. The malate dehyrogenase reaction has a ) G ’ of 29 kJ/mole. In most mitochondrial prepartions the ratio of o [NAD ]/[NADH] is 10 and the [malate] is 0.2 mM. Calculate the concentration of oxaloacetate. (10 ponts). +...
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a Adenine b Aspartate c Creatine d Glutamate e Ornithine 25...

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