311cFall09Homework4 - 2 H 5 OH can be burned and is...

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Intro Bio I (BIO 311C), Fall 2009, Dr. Bushart Homework #4 1. Why would you not expect to find dUTP in cells? 2. Amylose and cellulose are both made of glucose so why are amylose fibers helical while cellulose fibers are straight? Explain more than just the names of the bonds. 3. Cell membranes are self healing, meaning if a membrane was torn, it would automatically re-seal to form a closed compartment. Explain why this is so. 4. What would freezing temperatures do to the rate of a reaction and why? Why then are icy conditions favorable to polymerization reactions when we consider molecular evolution? 5. Draw a structural isomer of a triose (C 3 H 6 O 3 ) in such a way that we would not consider it a carbohydrate anymore. 6. Ethane (C 2 H 6 ) is a component of natural gas, and can be burned to produce heat and light energy. Likewise, 100% ethanol (C
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Unformatted text preview: 2 H 5 OH) can be burned and is sometimes used in labs for alcohol lamps. Which molecule would produce more energy per mol when completely combusted? Explain. 7. Would you expect the enzyme that catalyzes the formation of an α 1,6-glycosidic bond to be the same one that forms the α 1,4-glycosidic bond? Why or why not? 8. Cellulose fibers (bunches of cellulose molecules) are not water soluble. This is good because cotton threads are made of cellulose and it would not be very convenient to have your clothing or house dissolve in the rain. β-glucose is soluble in water, so how might you explain the insolubility of cellulose? 9. Would phospholipids need to form a bilayer if they were carefully poured onto the surface of water rather than being mixed up into the water? Why or why not?...
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