If one assumes that a penny is a simple cylinder with a diameter of 19.0 mm and a height of 1.5 mm, what is the approximate thickness of copper on the penny (the density of copper is 8.93 g/mL):

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products