Core_exam_I_2007_key

Core_exam_I_2007_key - BIOLOGY 130 EXAMINATION I 2007 _Key_...

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BIOLOGY 130 __________ Key ________________ NAME EXAMINATION I – 2007 1. (2 pts) Of course there’s more to life than just amino acids. And yet, most of the day-to- day functions of life depend upon amino acids – at least, upon amino acids strung together in specific patterns. In that state we see new properties that weren’t shown by the same population of amino acids before they became linked. Properties like this, which are mani- fested at one level of structure but not at its lesser levels, are most properly referred to as a.intrinsic properties. b. cryptic properties. c.miraculous properties. d. holistic properties. e.emergent properties. f. vital properties. 2. (2 pts) Amylase will induce the hydrolysis of just one type of substrate: starch. This sin - gularity of focus by an enzyme is called a.cooperativity. b. specificity. c.catalysis. d. kinesiology. e.reductionism. 3. (2 pts) Transport of individual solutes across a membrane in a direction with that dictated by their concentration gradient is called a.phagocytosis. b. exocytosis. c.osmosis. d. active transport. e.diffusion.
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(2 pts) Physostigmine is an alkaloid of the Calabar bean, once used in West Africa as a po- tent "ordeal" poison in trials of persons accused of witchcraft. (If the accused lived, they were judged innocent – seems fair.) Now it’s useful as an experimental chemical because it can inhibit the enzyme acetylcholinesterase, which hydrolyzes the neurotransmitter acet- ylcholine, producing the products choline and acetic acid. Based upon the stated mode of action, which of the following would be the immediate result of ingesting physostigmine? a.The sodium-potassium pump will cease to function. b. Levels of choline and acetic acid rise. c.Acetylcholine levels drop. d. Cyclic GMP levels drop. e.Levels of 5-alpha-dihydro-testosterone rise. f. Acetylcholine concentration rises above normal physiological levels. 5. (2 pts) You shouldn’t be surprised to learn that many poisons act by inhibiting enzymes. Yet your book’s discussion of enzyme inhibitors also describes how cells themselves pro- duce inhibitors of their own enzymes, which play essential roles in regulating certain meta- bolic pathways – pathways that can be switched off when their end products build up. Such a regulatory mechanism is called a.entropic equilibrium. b. non-cooperativity. c.metabolic dystrophy. d. thermal denaturation. e.feedback inhibition. 6. (2 pts) Which of the following is exergonic? a. digestion of a tofu-burger b. synthesis of a polysaccharide c.a process that requires energy d. a process with a positive G e.All of the above are exergonic. 7. (2 pts) The following two molecules are about to join into a dipeptide. Circle the atoms (and just those atoms) that that will depart in the reaction. 2
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This note was uploaded on 04/17/2008 for the course BIO 130 taught by Professor Various during the Fall '07 term at Rhodes.

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Core_exam_I_2007_key - BIOLOGY 130 EXAMINATION I 2007 _Key_...

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