3.4.2 The Movement of Substances Across the Plasma Membrane in Everyday Life (Structured Question 1 & 2)

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 more3.4.2 The Movement of Substances Across the Plasma Membrane in Everyday Life (Structured Question 1 & 2)

3.4.1 The Movement of Substances Across the Plasma Membrane (Structured Question 1 & 2)

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 RCarrier protein, with letter S [2 marks] (b) State two characteristics of the phospholipid bilayer. [2 marks](c) Name the process of the movement of substances across the … Read more3.4.1 The Movement of Substances Across the Plasma Membrane (Structured Question 1 & 2)

3.2.3 Types of Solution – Hypertonic

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 SolutionWater concentration: Water concentration inside the cell is higher than outside the cell.Solute Concentration: Solute concentration inside the cell is lower than outside the cell.Effect of Hypertonic Solution … Read more3.2.3 Types of Solution – Hypertonic

3.2.2 Types of Solution – Isotonic

What is Isotonic Solution?In isotonic solutions, both solutions have equal water potential.Water Concentration and Solute Concentration of a Cell in a Isotonic SolutionWater concentration and solute concentration are equal in both solutions.Effect of Isotonic Solution on Animal CellIf an animal cell such as red blood cell is placed into a isotonic solution, amount of water … Read more3.2.2 Types of Solution – Isotonic

3.2.1 Types of Solution – Hypotonic

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 SolutionWater concentration: Water concentration inside the cell is lower than outside the cell.Solute Concentration: Solute concentration inside the cell is higher than outside the cell.Effect of Hypotonic Solution … Read more3.2.1 Types of Solution – Hypotonic

3.1.4 Active Transport

What is Active Transport?Active transport is the movement of substances across the plasma membrane of cells against the concentration gradient (From lower concentration to higher concentration).Since it is against the concentration gradient, energy is needed in the process.Video below shows how particles are transported through the carrier protein in active transport. Take notes that the … Read more3.1.4 Active Transport

3.1.3 Passive Transport – Facilitated Diffusion

What is Facilitated Diffusion?Facilitated diffusion is the passive transport of substances across the plasma membrane with the help of transport proteins such as the channel protein and the carrier protein.Substances Pass through the Plasma Membrane through Facilitated DiffusionParticles undergo facilitated diffusion are the particles that cannot diffuse through the phospholipid bilayer such asLarge particles such … Read more3.1.3 Passive Transport – Facilitated Diffusion

3.1.2 Passive Transport – Osmosis

What is Osmosis?Osmosis is the diffusion of a water through a semi-permeable membrane, from a solution of low solute concentration to a solution with high solute concentration.It is a physical process in which a solvent moves, without input of energy, across a semi-permeable membrane separating two solutions of different concentrations.Important Points:It is the diffusion of … Read more3.1.2 Passive Transport – Osmosis