Exploring Cell Size Efficiency

The video tutorial demonstrates a lab experiment called 'Cell Size Efficiency' or 'Jello Jigglers Lab'. It begins with safety precautions and introduces agar as a model for cell texture. Phenolphthalein is used as an indicator that turns pink in the presence of sodium hydroxide. The experiment involves testing agar cubes of different sizes to observe color changes when exposed to sodium hydroxide. The results show how nutrients penetrate the cubes. A second experiment with salt cubes measures electrical conductivity in water, illustrating waste production in cells. The video emphasizes precise measurement and safety throughout.

What substance is used to model the texture of a cell in this lab?

• Gelatin

• Pectin

• Agar

• Starch

What indicator is used in the phenolphthalein cubes to show the presence of a base?

• Bromothymol blue

• Methyl orange

• Phenolphthalein

• Litmus

What is the purpose of using a scalpel in the preparation of the cubes?

• To trim the cubes to precise sizes

• To mix the ingredients

• To stir the solution

• To measure the temperature

What is the size of the largest cube used in the experiment?

• 1 cm x 1 cm x 1 cm

• 4 cm x 4 cm x 4 cm

• 2 cm x 2 cm x 2 cm

• 3 cm x 3 cm x 3 cm

How long were the phenolphthalein cubes left in the sodium hydroxide solution?

• 20 minutes

• 15 minutes

• 10 minutes

• 5 minutes

What color do the phenolphthalein cubes turn in the presence of sodium hydroxide?

• Pink

• Yellow

• Green

• Blue

What is the purpose of measuring the distance the nutrients traveled into the cubes?

• To determine the size of the cubes

• To measure the absorption efficiency

• To find the weight of the cubes

• To check the temperature of the solution

What substance are the cubes made of in the waste production experiment?

• Salt

• Vinegar

• Sugar

• Baking soda

What does higher electrical conductivity in the water indicate?

• More salt has dissolved

• Less salt has dissolved

• The water is pure

• The water is contaminated

Which cube produced the highest slope in the conductivity graph?

• Small cube

• All cubes produced the same slope

• Medium cube

• Large cube