This lesson describes the movement across cell membranes by simple and facilitated diffusion and describes how the rate is increased. The PowerPoint and accompanying resources have been designed to cover the second part of specification point 2.3 of the AQA A-level Biology course and the limitations imposed by the phospholipid bilayer and the role of channel and carrier proteins are described in detail.
The structure and properties of cell membranes was covered in the previous lesson so this one has been written to include continual references to the content of these lessons. This enables links to be made between the movement across a cell membrane with the concentration gradient, the parts of the membrane that are involved and any features that may increase the rate at which the molecules move. A series of questions about the alveoli are used to demonstrate how a large surface area, a short diffusion distance and the maintenance of a steep concentration gradient will increase the rate of simple diffusion. One of two quick quiz rounds is then used to introduce temperature and size of molecule as two further factors that can affect simple diffusion. The remainder of the lesson focuses on facilitated diffusion and describes how transmembrane proteins are needed to move small, polar or large molecules from a high concentration to a lower concentration across a partially permeable membrane.
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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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