A bag made of a selectively permeable membrane contains a 0.2M starch solution. It is placed in a beaker with a 0.4M starch solution. How will the molecules move across the membrane to try to reach equilibrium?

A) Water and starch will move into the bag.
B) Water and starch will move out of the bag.
C) Water will move into the bag, but starch will not move across the membrane.
D) Water will move out of the bag, but starch will not move across the membrane.
E) Starch will move into the bag, but water will show no net movement across the membrane.

Question

18-11-2023
Biology

College

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A bag made of a selectively permeable membrane contains a 0.2M starch solution. It is placed in a beaker with a 0.4M starch solution. How will the molecules move across the membrane to try to reach equilibrium?

A) Water and starch will move into the bag.
B) Water and starch will move out of the bag.
C) Water will move into the bag, but starch will not move across the membrane.
D) Water will move out of the bag, but starch will not move across the membrane.
E) Starch will move into the bag, but water will show no net movement across the membrane.

Answer :

Final answer:

In this scenario, water will move into the bag containing the 0.2M starch solution while starch will not pass through the selectively permeable membrane. This movement occurs due to the concentration gradient, where water moves toward the higher concentration of starch outside the bag. Thus, the correct answer is that water moves into the bag, but starch does not.

Explanation:

Understanding Molecular Movement Across a Selectively Permeable Membrane

In the scenario presented, a bag with a 0.2M starch solution is placed in a beaker containing a 0.4M starch solution. The key to understanding how the molecules will move lies in the concept of osmotic pressure and concentration gradients.

The selectively permeable membrane allows only certain molecules to pass through, typically permitting the movement of water while restricting the movement of larger molecules like starch. In this case, water will move from an area of lower starch concentration (inside the bag) to an area of higher concentration (outside the bag) in an attempt to equalize the concentration on either side of the membrane.

As a result, the expected movement of the molecules is:

Water will move into the bag, diluting the solution inside it.
Starch will not move across the membrane due to its large size.

Therefore, the correct answer to the question is:

Conclusion:

Option C: Water will move into the bag, but starch will not move across the membrane.

Learn more about osmosis here:

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