Exam 1 key

Exam 1 key - NameandHUID Life Sciences 2 Midterm #1...

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Name and HUID p. 1 Life Sciences 2 Midterm #1 Question # Graders #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 Total
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Name and HUID p. 2 1) What two hormones stop the uterine lining from being shed after an embryo has implanted and where are these hormones synthesized? (2 points) 1.0 point each (0.5 points for the hormone and 0.5 points for the location) Progesterone – corpus luteum Human Chorionic Gonadotropin Hormone – HCG – placenta (could also say trophoblast) 2) Name two organs derived from the ectoderm and two tissues derived from the endoderm. (2 points) 1 point – ectoderm tissues (0.5 points each) – Any organs of the epidermis, nervous system, eyes, ears, nose (most of head) 1 point – endoderm tissues (0.5 points each) – Any organs of the digestive, respiratory, most of the endocrine system They receive ½ credit if they give a system and not an organ 3) Why do birds not use glycogen as their primary energy source during long distance migrations? (2 points) 1 point Birds use lipids instead of because per unit weight (per lb or kilo) it is more effective to use lipid because you get more ATP per unit weight of lipid technically, not more efficient to burn lipid vs carbohydrate – it's the weight savings that's key (along with overall amount and effect on rate of oxidation) 1 point – glycogen is a limited fuel supply (you can only store a limited amount) and birds will want to conserve glucose for the brain during a long distance migration. Students may say that if birds depended on glycogen for fuel during a long distance migration they would “hit the wall” and not be able to continue. You should give them full credit if the say that there is a limit of fuel supply on glycogen or if they talk about the need to glucose spare for the brain (not all the points I mention above have to be present for full credit just one). 4) What is an oxygen debt? Explain the effect that sprint exercise has on your oxygen debt, as compared to sustainable exercise. (2 points) 1 point – an oxygen debt is the additional oxygen that must be taken into the body after exercise to restore all of the ATP and PCr to resting values and to convert lactic acid produced by glycolysis into pyruvate.
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Name and HUID p. 3 1 point – since more energy is produced anaerobically during sprinting there is more lactate to be converted and a greater oxygen debt at the cessation (end) of exercise. 5) Excluding ATP, list major end products of glycolysis under anaerobic conditions. Why can you NOT use anaerobic metabolism as a source of fuel to support muscle activity during your entire Saturday run with Dr. Lieberman? (2 points) 0.5 points each (1 point total) – pyruvate and lactic acid are the major end products of glycolysis.
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Exam 1 key - NameandHUID Life Sciences 2 Midterm #1...

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