Question

question 8
1 pts
what happens if you put a dialysis bag filled with glucose in a beaker that contain pure water.

only glucose can move in and out of the bag.
only water can move in and out of the bag.
there will be no movement in and out of the bag.
water move into the bag by osmosis and glucose moves out of the bag by diffusion.

Explanation:

🆕 New Concept Discovered: Passive Transport and Membrane Permeability
Movement of solutes and water across a semipermeable barrier

Step 1: Understand the properties of a dialysis bag

A dialysis bag acts as a semipermeable membrane. It has tiny microscopic pores that allow small molecules (like water and glucose) to pass through, while blocking very large molecules (like starch or proteins). Both water and glucose are small enough to cross this membrane.

Step 2: Analyze the movement of glucose (diffusion)

• Inside the bag: High concentration of glucose.
• Outside the bag (beaker): Pure water (zero glucose concentration).
• Movement: Glucose molecules will naturally move down their concentration gradient from where they are highly concentrated (inside the bag) to where they are less concentrated (outside in the beaker). This process is called diffusion.

Step 3: Analyze the movement of water (osmosis)

• Inside the bag: Lower water concentration (because of the dissolved glucose solutes).
• Outside the bag (beaker): Higher water concentration (pure water).
• Movement: Water molecules will move down their concentration gradient from the area of higher water concentration (the beaker) to the area of lower water concentration (inside the bag). The diffusion of water across a semipermeable membrane is called osmosis.

Step 4: Combine the movements

Because the dialysis membrane is permeable to both substances:

• Water moves into the bag by osmosis.
• Glucose moves out of the bag by diffusion.

This matches the fourth option.

Answer:

Water move into the bag by osmosis and glucose moves out of the bag by diffusion.