Question

(48) A student put some drops of Lugol's iodine solution into the water in the beaker

shown above. The water turned red. After a short time, the starch solution inside the

dialysis tubing turned black.

Which function of the cell membrane was the student demonstrating?

A. Facilitated diffusion of starch

B. Active transport of hydrogen ions

(C. Diffusion through a non-permeable membrane

D. Diffusion through a semipermeable membrane

Answer 1

Answer: The correct answer is : D. Diffusion through a semipermeable membrane

Explanation: The semipermeable membrane is also called selectively permeable or partially permeable membrane. It is a membrane that allows certain molecules or ions to pass through it through diffusion. The step depends on several factors such as: concentration, temperature of the molecules or solute, osmotic pressure and electrochemical gradient.

Answer 2

D. Diffusion through a semipermeable membrane

Step-by-step explanation:

Diffusion refers to the movement of particles from a section in which there are more of them (high concentration) into a section where there are less of them (low concentration) until both sections are equal.