BIO311c-OldExam3 - &c"ntroductory!io0ogy#9;<=> 2...

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!"# %&&c "ntroductory !io0ogy " 2. 4athasivan #9: ;<=> % ?ead each Auestion carefu00y before you select the Cest answer for 1uestions 1452 and fill in the appropriate blan9 in the scantron form with a ;2 pencil. =ach 1uestion is worth 2.0 points. ?nswer all the 52 1uestions. @he best 50 1uestions will be considered for a maximum of 100 points. >etaCo0ism 1) ?nabolic pathways ?) consume energy to build up polymers from monomers. D) are normally exergonic C) are always exothermic D) release energy as they degrade polymers to monomers. =) all the choices are correct. 2) ?ccording to the first law of thermodynamics, ?) some special people can create things out of thin air D) the universe loses energy because of friction. C) matter can be neither created nor destroyed. D) all processes increase the entropy of the universe. =) energy is neither created nor destroyed. 3) @he mathematical expression for the change in free energy of a system is: ! ! K ! " 4 # ! % . Which of the following is incorrect? ?) ! ! is negative for exergonic reactions. D) # is the absolute temperature. C) ! " is the change in heat. D) ! % is the change in entropy. =) ! ! is always negative at high temperatures. 4) Which of the following statements regarding enzymes is &’() ? ?) =nzymes decrease the rate of a reaction. D) =nzymes prevent changes in substrate concentrations. C) =nzymes are permanently altered by the reactions they catalyze. D) =nzymes increase the rate of reaction. =) =nzymes change the direction of chemical reactions. 5) @he active site of an enzyme is the region that ?) binds with the [email protected] D) binds with the substrate. C) is inhibited by a coenzyme or a cofactor. D) binds with allosteric inhibitors. =) none of the above 6) =thanol is given as an antidote to methanol poisoning. Methanol is converted by the enzyme alcohol dehydrogenase (?DH) to formaldehyde and ethanol is converted to acetaldehyde by ?DH. What could be the possible mechanism of this antidote effect? ?) methanol coverts ethanol and ma9es it less toxic and then eliminated through urine D) ethanol coverts methanol and ma9es it less toxic and then eliminated through urine C) ?DH is inhibited by ethanol and then stops wor9ing to ma9e acetaldehyde D) ?DH is inhibited by methanol and then stops wor9ing to ma9e formaldehyde =) =thanol competes out methanol as the substrate preferred by the enzyme
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BIO 311c Old Exam 3 K. Sathasivan 2 7) Which of the following would decrease the entropy within a particular system? ?) [email protected] hydrolysis in the muscle cells D) burning of fossil fuels to drive the car to school C) digestion of the food you had prior to the exam D) generation of fat from the increased consumption of simple sugars =) aerobic respiration to ma9e [email protected] W) When glucose monomers are joined together by glycosidic lin9ages to form a cellulose polymer, the changes in free energy, enthalpy, and entropy are as follows: ?) 4 ! !* 4 ! "* 4 ! % D) 4 ! !* Y ! " , Y ! % C) Y ! !* Y ! "* Y ! % ! E F ! G, F ! H, G ! S =) Y ! !* 4 ! " , 4 ! % Z) @he hydrolysis of sucrose by the enzyme sucrase results in ?) the release of free water from sucrose as the glycosidic lin9age between glucose and fructose is bro9en.
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