![]() This is a great simulation although it does take some setting up. This page is also useful in reminding students of the key features when they construct their table. The processes of diffusion, active transport and osmosis can be summarised by having students produce a revision table that contains the similarities and differences of each process. Students can be reminded about the process of cellular respiration and that this is the process that provides the energy for active transport. ![]() Stress that this carrier protein needs energy to do this. The animation can be used to point out how the transport protein carries the molecule into the cell where there is already a high concentration present. What is moving up a gradient likely to need? The process is called active transport as it requires energy. Suggest that there are times when cells need to move molecules up a concentration gradient. Active transport can be looked at first by reminding students that diffusion sees molecules move down a concentrations gradient. ![]() It can be found by scrolling to the bottom of the page. This is an animation showing active transport, diffusion and osmosis. Further information is provided in our Health and Safety guidance. eLibrary users are responsible for ensuring that any activity, including practical work, which they carry out is consistent with current regulations related to Health and Safety and that they carry an appropriate risk assessment. Do NOT follow suggestions which conflict with current advice from CLEAPSS, SSERC or recent safety guides. Whilst this list provides a source of information and ideas for experimental work, it is important to note that recommendations can date very quickly. Using animations and getting students to do "the voice over" or getting students to give presentations to articulate the processes can help to ensure that misconceptions do not occur. Similarly students have difficulty understanding the term net movement and concentration gradient, as well as the difference between active and passive movement. ![]() ![]() As this is a fundamental concept which is then seen in many other GCSE Biology topic areas, it is vital that students understand the mechanisms fully.Ĭonfusion is often seen in terms of the differences between diffusion and osmosis, so it is important to stress this difference clearly, and reinforce and revise it in other topics,ensure that students clearly understand that osmosis is only ever the movement of water. The transport of substances is often a difficult and abstract concept for students and as such a number of misconceptions occur. Having an understanding of all three processes should allow students to compare the processes and explain the differences between them. With active transport students need to explain how substances are moved against a concentration gradient and that this requires energy from respiration. Similarly students need to explain how water may move across the cell membrane via osmosis. Students need to be able to explain what diffusion is, examples of substances transported in and out of cells by diffusion and the factors that affect the rate of diffusion. The mechanisms by which substances can move into and out of cells, across cell membranes, needs to be clearly understood by GCSE Biology students. ![]()
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