classes_spring08_153A-1ID29_080411_Q1_Keys

classes_spring08_153A-1ID29_080411_Q1_Keys - 3'08 Ql Lecl...

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Unformatted text preview: 3'08 Ql Lecl lay) 1. In one liter of water, 50 mmol of acetic acid and 120 mmol of acetate were mixed. a) Given that the pKa of acetic acid is 4.76, calculate the pH of this particular solution. Show ALL your work in the space below for credit (2 pts). b) Is this particular solution a good buffer (0.5 pt)? Circle one® No H Work. H comet 0Mst P‘J’ ; 4.79 r 0.36 = 5M 2. ATP, a biomolecule, is drawn below. 3) Completely circle only the imidazole functional group (1 pt). b) Draw one water molecule (with approximately the correct bond angles) forming two hydrogen bonds with ATP’s phosphoanhydride functional group (2 pt). c) Do you expect ATP to be hydrophobic, hydrophilic, or amphipathic? (1 pt) Myélh‘iw [4‘0 Pl wmlcr AWN bud“ ho ‘ M New W/ PM? W‘A‘HZN ,0 \H H 5 , \N o a “A N Tim we WWW “ OH OH 3. Draw the complete structure of the predominate tyrosine species found in an aqueous solution of pH 7.0. Be sure to draw the correct ionization state of each functional group (3 pts). + ‘ halal; (UV) +0.5 6" (M Coo- EH e+ r V 5 l + -—(,-'H' tan . Cfliz Hi”, 7’"; csu / gPWooiZ 01 L602. keg 1. In 1.5 liters of water, 20 mmol of acetic acid and 6 mmol of acetate were mixed. a) Given that the pKa of acetic acid is 4.76, calculate the pH of this particular solution. Show ALL your work in the space below for credit (2 pts). b) Is this particular solution a good buffer (0.5 pt)? Circle one: @o ” + M l = 4.24 PH Pk“ £03 [21ch 016141 9’ P” $4.76 ”205 léw‘ml/ISL) +l work GOWWWSL) 11 correct amen/arm (01+: ‘f.7b+(—o.52,) No mid 14 work lsnls um mm? m Cami (#115 shown. 2. AT P, a biomolecule, is drawn below. a) Completely circle only the imidazole functional group (1 pt). b) Draw one water molecule (with approximately the correct bond angles) forming two hydrogen bonds with ATP’s hydroxyl functional roups (2 pt). _ c) Do you expect ATP to be hydrophobic? or amphipathic? (1 pt) Who \N Wa+cr molecule “fetid 1"» lac 1;chth +l. OH O_H “H“ {a ”70" WSW “v” «grittwvfrfl mfirpu 1,0031% MW .7: MAM“: 3. Draw the complete structure of the predominate glutamine species found 1n an aqueous solution of pH 7.0. Be sure to draw the correct ionization state of each functional group (3 pts). ‘ . t 0'; 9+ min 104131191200? 1 *‘ l’lr n+3 N «C’l—l rt ”1* (:141 CW / 111»! ...
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