An enzyme with Km = 3x10-4 M was tested with an initial substrate concentration of 10-6 M. Within one minute, 5% of the substrate had reacted. a) What percentage of substrate will have reacted in 5 min? b) If the initial concentration of substrate was 8x10-7 M, what percentage of substrate will have reacted in 5 min? c) Calculate Vmax. d) A concentration of 9x10-7 M, how long will it take for 50% of the substrate to react? e) A 10-6 M concentration, how long will it take for 75% of the substrate to react?