506_507_quiz_9

506_507_quiz_9 - amino acid that results in the formation...

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Name _____________________________ UIN ___________________ Biochemistry 411 Quiz 9 1.) ( 4 Points ) The liver produces lipoprotein particles called very low density lipoproteins (VLDL) and high density lipoproteins (HDL). Briefly describe the role these lipoproteins play in cholesterol metabolism. Answer: VLDL delievers triacylglycerols and cholesterol to tissues, forming low density lipoprotein (LDL) or “bad cholesterol.” HDL returns unwanted cholesterol to the liver as bile acids and is referred to as “good cholesterol.” 2.) ( 4 Points ) Show the first half of the mechanism of a transaminase enzyme reacting with an
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Unformatted text preview: amino acid that results in the formation of pyradoxamine phosphate ( hint: PLP is the cofactor ). 3.) ( 2 Points ) What is the purpose of the urea cycle in land animals? Answer: To form urea from excess nitrogen so that it can be excreted from the body. N H C NH H LYS OH PO CO 2 C R H H 3 N CH 3 N H C H N H OH PO CH 3 CO 2 C R H LYS NH 3 B N H HC H N OH PO CH 3 CO 2 C R H O H N H HC OH PO CH 3 NH 2 R C CO 2 O Transaminase-PLP amino acid keto acid product Pyradoxmine Phosphate...
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