The enzyme penicillinase in certain bacteria is used to decompose penicillin and render it inactive. The Michaelis-Menten constants for this enzyme and substrate are KM = 5.0 × 10−5 M−1 and k2 = 2.0 × 103 s−1. (a) What is the maximum rate of decomposition of penicillin if the enzyme concentration is 9.0 × 10−7 M? (b) At what substrate concentration will the rate of decomposition be 45% of that determined in (a)? (a) × 10 M s−1 (b) × 10 M