# exam 1 - Midterm 1 Exam Review 1 Draw a peptide bond...

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Midterm 1 Exam Review 1. Draw a peptide bond between any two amino acids at the pH of 6 and circle the peptide bond? Also, indicate all alpha carbons? 2. Consider the follow reaction. X Y + D ; Keq = 10 ^-8 . Calculate the standard free-energy change? ∆G 0’ = -RTln(Keq) ∆G 0’ = -(1.98 kcal/K*mol)(298.15K) [ ln(1x10 ^-8 ) ] ∆G 0’ = +1.08 kcal/mol 3. Consider a reaction similar as in question 3, who’s ∆G 0’ is determined to be +2.9kcal/mol. a. Calculate the equilibrium constant of the reaction? (Note that ∆G 0’ is given in kcal so you do not need to convert R before plugging it in to the equation) ∆G 0’ = -RTln(Keq) +2.9kcal/mol = -[(1.98cal/mol)/1000] (298.15K) ln(Keq) [ (2.9kcal/mol) ] e [ -0.5662 kcal/mol] = Keq = 0.0073 b. In spite of the positive ∆G 0’ , how can this reaction go on inside a cell? - if you increase the concentration of the Reactant. 4. Consider the follow reaction GTP GDP + Pi. For this reaction the ∆G 0’ is -4.9kcal/mol. [GTP]= 10 -1 mM, [GDP]= 10 -3 mM, [Pi]=10 -5 . Calculate ∆G for this reaction? -

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exam 1 - Midterm 1 Exam Review 1 Draw a peptide bond...

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