ch369_f09_practice_final

ch369_f09_practice_final - Chemistry 369 Practice Final...

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Chemistry 369 Practice Final Exam Fall 2009 1) What are the products of the reaction below, catalyzed by lipoprotein lipase, or lipase? Provide chemical structures of the products. 2) Rank the following 3 types of particles in order of lowest to highest lipid content: chylomicrons, low density lipoprotein particles, high density lipoprotein particles. lowest lipid content highest lipid content 3) Which membrane does the carnitine transporter move molecules across? 4) If the acyl-CoA molecule shown below enters the beta oxidation cycle, what will be the chemical structure of the new acyl-CoA that results after one cycle (meaning, a single 4-step cycle) of beta oxidation? 5) In eukaryotic cells, branched chain fatty acids are oxidized in a membrane- enclosed organelle called a ______________________________. 6) For long-term storage, lipids are stored in the interior of this type of cell _______________________ in this chemical form: ____________________________. 7) The enzyme thiolase catalyzes one of the steps in the beta oxidation pathway. What are the products of the reaction below, catalyzed by the enzyme thiolase? 8) Which of the following bonds require the most energy to break? (circle one) a) disulfide bonds b) hydrogen bonds c) ion pairings between oppositely charged amino acids d) All of the above have nearly equal strength
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9) (a) In humans, fatty acid synthesis occurs primarily in which type of cells? type of cells (or body organ) where fatty acid synthesis occurs: _____________________ (b) In humans, fatty acid synthesis occurs primarily in which sub-cellular region? (fill in blank below) sub-cellular region for fatty acid synthesis: ____________________________________ 10) The enzyme catalase is used to break down a toxic molecule that forms in peroxisomes, to yield water and oxygen. What is the toxic molecule that is broken down by catalase? 11) What is the name of the molecule below, which is a common membrane component in humans? 12) What is the approximate diameter of an E. coli cell? 13) If a cis- fatty acid and a trans- fatty acid have the same number of carbons and the same number of double bonds, which probably has the higher melting temperature? 14) A culture of yeast cells is given some pyruvate that has all of its oxygens enriched in the isotope 18 O. After a few minutes, a gas that contains 18 O is released. What is this gas?
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