This fully-resourced lesson describes how the cells of multicellular organisms are specialised for particular functions and organised into tissues, organs and organ systems. The detailed and engaging PowerPoint and accompanying resources have been designed to cover points 2.1.6 (h, i, j and k) of the OCR A-level Biology A specification and also describes how stem cells differentiate, including the production of erythrocytes (red blood cells) and neutrophils.
The start of the lesson focuses on the difference in the SA/V ratio of an amoeba and a human in order to begin to explain why the process of differentiation is critical for multicellular organisms. Students will discover that a zygote is a stem cell which can express all of the genes in its genome and divide by mitosis. Time is then taken to introduce gene expression as this will need to be understood in the later topics of the course. Moving forwards, the lesson uses the process of haematopoiesis from haematopoietic stem cells to demonstrate how the red blood cell and neutrophil differ significantly in structure despite arising from the same cell along the same cell lineage. A series of exam-style questions will not only challenge their knowledge of structure but also their ability to apply this knowledge to unfamiliar situations. These differences in cell structure is further exemplified by the epithelial cells of the respiratory tract and students will understand why the shape and arrangement of these cells differ in the trachea and alveoli in line with function. The link between specialised cells and tissues is made at this point of the lesson with these examples of epithelium and students will also see how tissues are grouped into organs and then into organ systems.
The remainder of the lesson focuses on specialised plant cells and the differing shapes and features of the palisade and spongy mesophyll cells and the guard cells are covered at length and in detail. Step by step guides will support the students so that they can recognise the importance of the structures and links are made to upcoming topics such as the vascular tissues so that students are prepared for these when covered in the future.
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Enzymes, biological membranes & cell division (OCR A-level Biology A)
This lesson bundle has been formed from the 13 detailed lesson PowerPoints and their accompanying resources that have been uploaded to cover a lot of the content in modules 2.1.4, 2.1.5 and 2.1.6 of the OCR A-level Biology A specification. Each lesson contains a wide range of tasks, which include exam-style questions (with mark schemes), guided discussion points, and quick quiz competitions, that will engage and motivate the students whilst covering the following specification points: Module 2.1.4: Enzymes * The role of enzymes in catalysing reactions that affect metabolism at a cellular and whole organism level * The role of enzymes in catalysing both intracellular and extracellular reactions * The mechanism of enzyme action * The effect of pH on enzyme activity * The effect of temperature on enzyme activity * The calculation of the temperature coefficient * The effect of enzyme and substrate concentration on enzyme activity * The need for coenzymes, cofactors and prosthetic groups in some enzyme-controlled reactions Module 2.1.5: Biological membranes * The fluid mosaic model of membrane structure and the roles of its components * Simple and facilitated diffusion as forms of passive transport * Active transport, endocytosis and exocytosis as processes requiring ATP as an immediate source of energy * The movement of water across membranes by osmosis and the effects that solutions of different water potential can have on plant and animal cells Module 2.1.6: Cell division, cell diversity and cellular organisation * The cell cycle * How the cell cycle is regulated * The main stages of mitosis * The significance of mitosis in life cycles * The significance of meiosis in life cycles * The main stages of meiosis * How cells of multicellular organisms are specialised for particular functions * The organisation of cells into tissues, organs and organ systems * The production of erythrocytes and neutrophils from stem cells in bone marrow If you would like to sample the quality of the lessons in this bundle, then download the following lessons as they have been uploaded for free: * The roles of enzymes and mechanism of action * Simple and facilitated diffusion * Cell specialisation and organisation
£20.00
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Module 2.1.6: Cell division, cell diversity and organisation (OCR A-level Biology A)
This lesson bundle contains 4 detailed lesson PowerPoints, which along with their accompanying resources have been designed to cover the majority of the content in module 2.1.6 of the OCR A-level Biology A specification. The lessons have been planned at length and include exam-style questions that will challenge the students on their current understanding, prior knowledge checks to encourage students to make links to previously covered topics, guided discussion points and quick quiz competitions to introduce memorable terms and values. The following specification points are covered by the resources in this bundle: * The cell cycle * How the cell cycle is regulated * The main stages of mitosis * The significance of mitosis in life cycles * The significance of meiosis in life cycles * The main stages of meiosis * How cells of multicellular organisms are specialised for particular functions * The organisation of cells into tissues, organs and organ systems * Stem cells as a renewing source of undifferentiated cells * The production of erythrocytes and neutrophils derived from stem cells in bone marrow If you would like to sample the quality of the lessons in this bundle, then download the cell specialisation and organisation lesson as this has been uploaded for free
£7.00
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