Diffusion and Glucose Testing Lab

The video tutorial demonstrates a diffusion through membrane lab. It begins with adding Lugal iodine to a beaker, followed by preparing a Ziploc bag with starch and glucose solutions to simulate a membrane. The bag is placed in the beaker to observe diffusion over two hours. A color change indicates interaction between iodine and starch. Glucose presence is tested using strips, comparing results with a control strip.

What is the first step in the diffusion through membrane lab?

• Adding Lugal iodine solution to the beaker

• Adding water to the beaker

• Adding glucose solution to the beaker

• Adding starch solution to the Ziploc bag

What is the purpose of the Ziploc bag in the experiment?

• To hold the Lugal iodine solution

• To measure the amount of glucose

• To act as a control for the experiment

• To serve as a model for a cell membrane

What happens when Lugal iodine and starch come into contact?

• They turn blue

• They remain colorless

• They form a dark purple color

• They turn green

How long should the Ziploc bag sit in the beaker with Lugal iodine?

• 3 hours

• 2 hours

• 1 hour

• 30 minutes

What is the role of the Lugal iodine solution in the experiment?

• To test for glucose

• To act as a membrane

• To indicate the presence of starch

• To dissolve the Ziploc bag

What conclusion can be drawn if the color inside the bag changes?

• The solutions are mixed

• The bag is leaking

• Diffusion has occurred

• The experiment failed

What is used to test for the presence of glucose in the solution?

• Thermometer

• pH meter

• Litmus paper

• Glucose testing strips

What is the purpose of comparing the tested glucose strip with a clean one?

• To measure the pH level

• To have a control for comparison

• To ensure the strip is clean

• To check the temperature

What color change indicates the presence of glucose in the solution?

• Yellow to brown

• Blue to green

• Red to blue

• Color change on the glucose strip

Why is it important to let the glucose test strip sit for 30 seconds?

• To dry the strip

• To ensure it is clean

• To cool the strip

• To allow the color to develop