Question

read the information and analyze the data below to answer the following questions. students conducted an experiment to identify the presence of carbohydrates, proteins, and lipids in three common food items: apple, peanut butter, and bread. they used standard biochemical tests. benedicts test was used for simple sugars (carbohydrates) biuret test for proteins * sudan iii test for lipids each food sample was tested separately, and results were recorded based on color changes indicating the presence or absence of each macromolecule. food sample apple peanut butter bread carbohydrates (benedicts test) present absent present proteins (biuret test) absent present present lipids (sudan iii test) absent present absent which of the following would be considered the control group in this experiment? (2pts) a a test tube with only water and reagents b a food sample known to contain all macromolecules c the bread sample d the apple sample

Explanation:

In an experiment, a control group is used as a baseline. It contains all the components of the experimental setup except the variable being tested. Here, a test - tube with only water and reagents has no food sample (the variable being tested for macromolecules), making it the control.

Answer:

A. A test tube with only water and reagents