Problem Set 2 S10 KEY

Problem Set 2 S10 KEY - Problem Set 2 Chapters 5-7 1)...

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Problem Set 2 BILD1 / Spring 2010 Chapters 5-7 Dr. Kiger 1 1) Polymers of polysaccharides, fats, and proteins are all synthesized from monomers by A) connecting monosaccharides together. B) the addition of water to each monomer (hydrolysis). C) the removal of water (dehydration reactions). D) ionic bonding of the monomers. E) the formation of disulfide bridges between monomers. 2) (a) What is a condensation reaction, and in general terms, what does it form? A reaction to covalently bond monomers through the loss of water. Condensation reactions form polymers. (b) Draw an example of the use of a condensation reaction to form sucrose [hint: a (1,2) glycosidic linkage between α - glucose and β -fructose]. 3) Glucose comes in two forms – a straight chain form and a ring form. (a) Which form predominates in the cell? Ring form, due to the cellular pH. (b) There are two ring forms called α -glucose and β -glucose. How do these two forms differ from each other? These two isomers differ only at the #1 carbon of glucose. The alpha version features the hydroxyl group below the planar ring ,whereas the beta version has the hydroxyl group above the ring. (c) What compounds are composed primarily of glucose? How do they differ from each other? The polymers starch, glycogen and cellulose are composed of glucose monomers. Starch is the major form of energy storage in plants, and glycogen is the major form of energy storage in animals. Both starch and glycogen are made up of alpha-glucose monomers. Cellulose is the major structural component of plants and is comprised of beta-glucose monomers. The linkages results in every other monomer being upside down. Animals have enzymes that can cleave glycosidic bonds between alpha monomers but not beta monomers. 4) (a) In general terms, what kind of monomer is shown in Figure 1? Monosaccharide, or single sugar. (b) Is the molecule in an alpha or beta form? FIGURE 1 Beta form.
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Problem Set 2 BILD1 / Spring 2010 Chapters 5-7 Dr. Kiger 2 5) Humans can digest starch but not cellulose because A) the monomer of starch is glucose, but the monomer of cellulose is galactose. B) humans have enzymes that can hydrolyse the beta (b) glycosidic linkages of cellulose but not the alpha (a) glycosidic linkages of starch. C) humans have enzymes that can hydrolyze the alpha (a) glycosidic linkages of starch but not the beta (b) glycosidic linkages of cellulose. D) humans harbor starch digesting bacteria but not cellulose digesting bacteria in their digestive tract.
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This note was uploaded on 10/16/2010 for the course BILD 1 taught by Professor Boulanger during the Spring '08 term at UCSD.

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Problem Set 2 S10 KEY - Problem Set 2 Chapters 5-7 1)...

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