Movement of Substances across a Plasma Membrane

Question 1:Diagram I and Diagram II show the movement of substances P and Q across the plasma membrane respectively. The movement of P needs energy but the movement of Q does not.(a) Name the processes involved in the movement of P and Q. (2 marks)(b)(i) Name one example of P and Q. (2 marks)(b)(ii) Describe … Read more

Question 1:Diagram I and Diagram II show two different types of movement of substances across the plasma membrane. (a) In Diagram I. label the following structures: Phospholipid bilayer, with letter R Carrier protein, with letter S [2 marks] (b) State two characteristics of the phospholipid bilayer. [2 marks] (c) Name the process of the movement … Read more

What is Hypertonic Solution? Hypertonic solution is the solution that has lower water potential than the other solution. Water Concentration and Solute Concentration of a Cell in a Hypertonic Solution Water concentration: Water concentration inside the cell is higher than outside the cell. Solute Concentration: Solute concentration inside the cell is lower than outside the … Read more

What is Isotonic Solution? In isotonic solutions, both solutions have equal water potential. Water Concentration and Solute Concentration of a Cell in a Isotonic Solution Water concentration and solute concentration are equal in both solutions. Effect of Isotonic Solution on Animal Cell If an animal cell such as red blood cell is placed into a … Read more

What is Hypotonic Solution? Hypotonic solution is the solution that has higher water potential than the other solution. Water Concentration and Solute Concentration of a Cell in a Hypotonic Solution Water concentration: Water concentration inside the cell is lower than outside the cell. Solute Concentration: Solute concentration inside the cell is higher than outside the … Read more