Calculate the ki for a competitive inhibitor whose, Ask an Expert

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a) Erythrocytes phosphorylate glucose to glucose 6-phosphate with the help of the enzyme hexokinase instead of glucokinase. Hexokinase has a Km = 0.04 mM. How low would the blood glucose concentration have to fall to decrease the rate of glucose phosphorylation in the erythrocyte to 65% of Vmax? (Assume that the Michaelis-Menten equation is applicable.)

b) Calculate the Ki for a competitive inhibitor whose concentration is 6.5 x10-5 M that increases the Km of the substrate by 24.5%.

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