This detailed and engaging lesson describes the movement of water molecules by osmosis and this is explained in terms of water potential. Both the PowerPoint and accompanying resources have been designed to cover the third part of specification point 2.3 as detailed in the AQA A-level Biology specification and they also describe the impact of solutions of different water potentials on suspended animal and plant cells.
It’s likely that students will have used the term concentration in their osmosis definitions at GCSE, so the aim of the starter task is to introduce water potential to allow students to begin to recognise osmosis as the movement of water molecules from a high water potential to a lower potential, with the water potential gradient. Time is taken to describe the finer details of water potential to enable students to understand that 0 is the highest value (pure water) and that this becomes negative once solutes are dissolved. Exam-style questions are used throughout the lesson to check on current understanding as well as prior knowledge checks which make links to previously covered topics such as the lipid bilayer of the cell membrane. The remainder of the lesson focuses on the movement of water when animal and plant cells are suspended in hypotonic, hypertonic or isotonic solutions and the final appearance of these cells is described, including any issues this may cause.
This lesson has been specifically written to tie in with the previous two lessons in topic 2.3 that cover the cell membrane and diffusion as well as an upcoming lesson on active transport and co-transport.
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Topic 2: Cells (AQA A-level Biology)
This bundle contains 19 PowerPoint lessons which are highly-detailed and are fully-resourced with differentiated worksheets. Intricate planning means that the wide range of activities included in these lessons will engage and motivate the students, check on their current understanding and their ability to make links to previously covered topics and most importantly will deepen their understanding of the following specification points in topic 2 (Cells) of the AQA A-level Biology specification: * Structure and function of the organelles in eukaryotic cells * The specialised cells in complex, multicellular organisms * The structure of prokaryotic cells * The structure of viruses which are acellular and non-living * The principles and limitations of optical, transmission electron and scanning electron microscopes * Measuring the size of an object under an optical microscope * Use of the magnification formula * The behaviour of chromosomes during the stages of the cell cycle * Binary fission * The basic structure of cell membranes * The role of phospholipids, proteins, glycoproteins, glycolipids and cholesterol * Simple diffusion * Facilitated diffusion * Osmosis, explained in terms of water potential * The role of carrier proteins and the hydrolysis of ATP in active transport * Co-transport as illustrated by the absorption of sodium ions and glucose by the cells lining the mammalian ileum * Recognition of different cells by the immune system * The identification of pathogens from antigens * The phagocytosis of pathogens * The cellular response involving T lymphocytes * The humoral response involving the production of antibodies by plasma cells * The structure of an antibody * The roles of plasma cells and memory cells in the primary and secondary immune response * The use of vaccines to protect populations * The differences between active and passive immunity * The structure of the human immunodeficiency virus and its replication in helper T cells * How HIV causes the symptoms of AIDS * Why antibiotics are ineffective against viruses * The use of antibodies in the ELISA test If you would like to sample the quality of these lessons, then download the eukaryotic animal cells, viruses, microscopes, osmosis, lymphocytes, HIV and AIDS lessons as these have been shared for free.
£25.00
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Topic 2.3: Transport across cell membranes (AQA A-level Biology)
This lesson bundle contains 4 fully-resourced lessons that use a wide variety of tasks to engage and motivate the students whilst covering the following specification points in topic 2.3 of the AQA A-level Biology specification: * The basic structure of cell membranes * The arrangement of phospholipids, proteins, glycoproteins and glycolipids in the fluid-mosaic model of membrane structure * The role of cholesterol in membranes * Simple diffusion and the limitations imposed by the phospholipid bilayer * Facilitated diffusion and the role of channel and carrier proteins * Osmosis in terms of water potential * Active transport * Co-transport as illustrated by the absorption in the ileum Hours of planning has gone into the lesson design to ensure that links are made to topics 2.1 & 2.2 as well as to topic 1 (biological molecules) and to differentiate resources where possible to challenge and support all abilities of students If you would like to sample the quality of lessons in this bundle, then download the osmosis lesson which has been shared for free
£5.50
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Good progression through lesson with easy to understand tasks. Thank you
Another great resource for online teaching . Thank you.
Some useful explanations, thank you for sharing.
Thank you, very detailed and engaging
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