Question

q9. a simcell has a special membrane that is permeable to alcohol but not to water. this simcell contains 20% alcohol and 80% water and is placed in a solution containing 40% alcohol and 60% water. what will happen to the cell? it will expand due to net movement of water into the cell. it will expand due to net movement of alcohol into the cell. it will contract due to net movement of water out of the cell. it will contract due to net movement of alcohol out of the cell. q10. fish that live in saltwater and fish that live in freshwater both have water - balance challenges that deal with osmosis. what is the best characterization of the challenges for each, based on your investigations in this lab? both types of fish must constantly get rid of excess water. freshwater fish must get rid of excess water and saltwater fish must retain the water they have. freshwater fish must retain the water they have and saltwater fish must get rid of excess water. both kinds of fish must retain as much water as they can.

Explanation:

For Q9, since the membrane is permeable to alcohol and there is a higher alcohol - concentration outside the cell (40% vs 20%), alcohol will diffuse into the cell causing it to expand. For Q10, freshwater has a lower solute concentration than the fish's body, so water moves into freshwater fish by osmosis and they must get rid of excess water. Saltwater has a higher solute concentration than the fish's body, so saltwater fish tend to lose water and must retain the water they have.

Answer:

Q9. It will expand due to net movement of alcohol into the cell.
Q10. Freshwater fish must get rid of excess water and saltwater fish must retain the water they have.