Question

1. When the SimCell membrane in the Cell-O-Scope jiggled back and forth, this was due to:
   1. Pressure against the membrane
   2. Osmosis causing molecules to flow across the membrane
   3. The membrane not being at equilibrium
   4. None of the above
2. Placing blood cells into a solution that is hypertonic to the cells will cause the osmotic pressure of the cells to:
   1. Increase
   2. Decrease
   3. Neither increase nor decrease
3. According to the rules of osmosis, a system will reach a state of equilibrium when there are equal numbers of ____ molecules on both sides of the water-permeable membrane.
   1. Solute
   2. Solvent
   3. Water
   4. None of the above
4. 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?
   1. Both types of fish must constantly get rid of excess water.
   2. Freshwater fish must get rid of excess water and saltwater fish must retain the water they have.
   3. Freshwater fish must retain the water they have and saltwater fish must get rid of excess water.
   4. Both kinds of fish must retain as much water as they can.

PLEASE PROVIDE EXPLANATIONS!! THANK YOU!!

Answer 1

ANS (2)-Option b is correct -decreased

EXPLANATION- Hypertonic solution is a kind of solution in which the osmotic pressure is higher outside the cell as compared to the osmotic pressure inside the cell. , and because of this the water molecules inside the red blood cells will start moving outside the cell to equalize the osmotic pressure both outside and inside of cells, but this causes the red blood cells to shrink up as the all water molecules inside the cell will move to outside the cell.as in this the osmotic pressure is decreased.

Osmotic pressure--->It is the minimum pressure that occurs on a solution to prevent the inward flow of molecules inside the cell through the semipermeable membrane.

EXPLANATION FOR INCORRECT OPTIONS-

Option c is incorrect that the osmotic pressure is neither increase or decrease because that only occurs in the isotonic solution, not in a hypertonic solution because in isotonic solution the osmotic pressure is the same inside and outside environment of the red blood cells.