Question 3 In this part of the experiment, you’ll test your three sucrose solutions: sucrose and water, sucrose and lactase enzyme, and sucrose and heated lactase enzyme. Follow the steps. Record your data in the answer space.

Collect three test tubes.

Fill the first test tube one fourth full of sugar. Fill your small graduated cylinder with water and add it to the test tube until the test tube is half full. Stir the solution until the sugar dissolves, and then insert the test strip for 10 to 20 seconds. Record whether the test strip changed color. Wash the stirrer.

Fill the second test tube one fourth full of sugar and one fourth full of the lactase solution. Thoroughly mix the solution. Insert the test strip for 10 to 20 seconds, and record whether it changed color. Wash the stirrer.

Fill the third test tube one fourth full of sugar and one fourth full of the heated lactase solution. Thoroughly mix the solution. Insert the test strip for 10 to 20 seconds, and record whether it changed color.

Pour the solutions down the drain. Remove the masking tape from the beakers. Wash the beakers, test tubes, and stirrer. If you used paper cups as an alternative, thrown them away.

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