Enzyme Structure and Function Define the following: product substrate Explain how enzymes function. Go to Lab, Section I, Exercise 1 to participate in an activity that demonstrates the importance of enzymes. Record the color intensity of the solution in each test tube at five and ten minutes. Time (min) Tube S1 Potato Extract + Catechol Tube S2 Potato Extract + Water Tube S3 Catechol + Water 0 5 10 How can benzoquinone be detected? Which two solutions need to be present to produce the reddish-brown benzoquinone? Enzyme Specificity Based on Lab, Section II, Exercise 2 what difference in chemical structure of the two substrates determines the specificity of catechol oxidase? What was the role of hydroquinone in the experiment? Temperature and Enzyme Activity Based on Lab, Section III, Exercise 3 record the relative color intensity at five-minute intervals to determine the temperature range for catechol oxidase.