View the corresponding PowerPoint presentatlon \"Urganic Molecules The Results" as you work your way through these laboratory procedures. While you won't actually be \"doing\" the lab exercises, the procedural steps are described below. This laboratory activity involves testing various liquids for the presence of carbohydrates, proteins, and lipids. When testing for the presence of a chemical substance, this procedure is called a chemical assay. A reagent is a substance used in a chemical reaction that detects or tests for the presence of another substance. For example, if the substance being tested for is present, a color change will occur indicating a positive result. If the substance is not present in the sample, no color change will occur indicating a negative result. Some laboratory experiments include positive and negative controls. The positive control contains the substance being tested for and goes through all the steps of the procedure. Therefore, a positive result is expected. A negative control does not contain the substance being tested for but still goes through all the steps of the procedure. A negative result is expected. Positive and negative controls are standard examples to which the experimental samples can be compared. Positive and negative controls are also used to test the accuracy and integrity of the experimental process. If a negative control sample yields a positive result, the experimental process is awed. If a positive control does not produce a positive result, again, the experimental process is awed. 1. A B10 1511 lab group is assaying for the presence of wheat our in various samples. The lab group is testing the following samples: rye bread, matzo crackers, wheat our, quinoa, water, yeast suspension, chocolate cake, pasta. a. ID the positive control b. ID the negative control c. ID the experimental samples