Osmosis and cells (OCR A-level Biology)

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