Prob_set_2ans - PS#2 Bio 1A Spr 2008 Prof Schlissel Name...

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PS #2 Bio 1A Spr 2008 Prof. Schlissel Name _______________________ Sect #___ 1) How does bond strength compare between hydrogen bonds and covalent bonds? Covalent bonds can be 50 to 100 times stronger 2) Fill in the names of the indicated functional groups or bonds: a—phosphate b—carbonyl c—hydroxyl d—ester e—carboxyl f—methyl g—sulfhydryl h-- amino 3) What feature do all phospholipids share in common? What is the difference between a phospholipid and a triglyceride? Two fatty acids and a phosphate linked to a glycerol backbone. Triglyceride lacks the phosphate and has a third fatty acid. They are a subset of lipids. 4) Define hydrophobic and hydrophilic? How do hydrophobic compounds interact with water? Doesn’t like to be exposed to water. Does like to be exposed to water. They tend to arrange themselves together to avoid contacting water leading to hydrophobic interactions.
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PS #2 Bio 1A Spr 2008 Prof. Schlissel Name _______________________ Sect #___ 5) In fat, how long (measured in carbon atoms) are the fatty acid chains that typically attach to glycerol? 14 to 20 6) What property of phospholipids results from the combination of hydrophobic and hydrophilic regions in the same molecule? How does this relate to all cells (from in mammals to bacteria)? Spontaneous assembly into lipid bilayers. All cells have phospholipid bilayer membranes. 7) Why don’t fats dissolve in water?
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