Osmosis: Plant Cells Osmosis is the?net movement of water molecules?from a region of?higher water potential?(dilute solution) to a region of?lower water potential?(concentrated solution), through a...
Estimating Water Potential in Plant Tissue It is possible to investigate the effects of immersing plant tissue in?solutions of different water potentials?and then?use the results to estimate the wa...
Investigating SA with Agar The effect of changing surface area to volume ratio on diffusion can be investigated by timing the diffusion of ions through cubes of agar of different sizes Method Colou...
Principles of SA:V Surface area?and?volume?are both very important factors in the?exchange of materials?in organisms The surface area refers to the?total area of the organism that is exposed to the...
Investigating Diffusion Investigating diffusion using Visking tubing Visking tubing?(sometimes referred to as dialysis tubing) is a non-living?partially permeable?membrane made from cellulose Pores...
Investigating Diffusion & Osmosis: Plant Tissue Investigating diffusion The?permeability?of cell membranes can be affected by environmental factors such as?chemicals or temperature This can be ...
Endocytosis & Exocytosis The processes of diffusion, osmosis and active transport are responsible for the transport of?individual molecules or ions?across cell membranes However, the?bulk trans...
The Process of Active Transport Active transport is the?movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration using energy ...
The Process of Osmosis All cells are surrounded by a cell membrane which is?partially permeable Water can move in and out of cells by?osmosis Osmosis is the?diffusion of water molecules?from a dilu...
Diffusion & Facilitated Diffusion Diffusion is a type of?transportation?that occurs?across the cell membrane It can be defined as: The net movement, as a result of the random motion of its mole...
Cell Signalling Cell signalling is the process by which messages are sent to cells Cell signalling is very important as it?allows multicellular organisms to control / coordinate their bodies and re...
Cell Surface Membranes Phospholipids Form the basic structure of the membrane (phospholipid bilayer) The tails form a hydrophobic core comprising the innermost part of both the outer and inner laye...
