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LABORATORY 2 THE MACROMOLECULES IN LIVING ORGANISMS Name: Date: Instructor: Section: PRE-LAB QUESTIONS Exercise I: Biochemical Assays Positive and Negative Controls 1. Read about the differences between positive and negative controls in the introduction to Exercise I: Biochemical Assays. Then fill in the blanks below with either "positive" or "negative. a. A control will show no response to the chemical added. b. A control is used to provide an example of what a positive response should look like. C. In all of the tests we will perform in this lab, water is used as a control. Benedict's Test for Simple Sugars 2. Read about Benedict's test for Simple Sugars in Procedure 2.1 and answer the following questions. a. What color change do you expect to see if there is a positive reaction to Benedict's reagent? b. Benedict's reagent tests solutions for a particular kind of simple sugar called a reducing sugar. Describe a reducing sugar by filling in the blanks below with terms from the introduction to Procedure 2.1. Reducing sugars give away. when mixed with metals. The metal in Benedict's reagent is PRE-LAB