Properties of Dialysis Tubing and Iodine Reaction

What is the primary characteristic of dialysis tubing that enables it to separate different substances?

• It is completely impermeable to all substances.

• It allows all substances to pass through freely.

• It acts as a semipermeable membrane.

• It actively transports specific molecules across.

What color change occurs when iodine is mixed with starch?

• It turns yellow.

• It turns red.

• It turns blue-black.

• It becomes colorless.

Based on the properties of the dialysis tubing, which statement accurately describes the movement of molecules?

• Large molecules like starch can easily cross the membrane.

• Small particles like iodine can cross the membrane, but large molecules like starch cannot.

• Neither small nor large molecules can cross the membrane.

• Only water molecules can cross the membrane.