pptx, 1.96 MB
pptx, 1.96 MB

This engaging lesson looks at the structure of the quaternary protein, haemoglobin, and describes its role with red blood cells in the transport of oxygen. The PowerPoint has been designed to cover the first part of point 3.4.1 of the AQA A-level Biology specification and explains how the cooperative nature of binding results in a loading of each molecule with 4 oxygen molecules and describes how it is unloaded at the respiring cells too.

The lesson begins with a version of the quiz show Pointless to introduce haemotology as the study of the blood conditions. Students are told that haemoglobin has a quaternary structure and are challenged to use their prior knowledge of biological molecules to determine what this means for the protein. They will learn that each of the 4 polypeptide chains contains a haem group with an iron ion attached and that it is this group which has a high affinity for oxygen. Time is taken to discuss how this protein must be able to load (and unload) oxygen as well as transport the molecules to the respiring tissues. Students will plot the oxyhaemoglobin dissociation curve and the S-shaped curve is used to encourage discussions about the ease with which haemoglobin loads each molecule. Students will learn that a conformational change upon binding of the first oxygen leads to it being easier to bind future oxygens and that this is known as cooperative binding.

This lesson has been written to tie in with the other uploaded lesson on the Bohr effect.

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Topic 3: Organisms exchange substances with their environment (AQA A-level Biology)

This lesson bundle contains 17 detailed and fully-resourced lessons which cover the following specification points in topic 3 of the AQA A-level Biology specification: Topic 3.1 * The relationship between the size of an organism or structure and its surface area to volume ratio * The development of systems in larger organisms as adaptations that facilitate exchange as this ratio reduces Topic 3.2 * Adaptations of gas exchange surfaces as shown by gas exchange in single-celled organisms, insects, bony fish and the leaves of dicotyledonous plants * The gross structure of the human gas exchange system * The essential features of the alveolar epithelium as a surface over which gas exchange takes place * The mechanism of breathing to include the role of the diaphragm and the intercostal muscles Topic 3.3 * During digestion, large molecules are hydrolysed to smaller molecules * Digestion in mammals by amylases, disaccharidases, lipase, endopeptidases, exopeptidases and dipeptidases * Mechanisms for the absorption of the products of digestion by cells lining the ileum of mammals Topic 3.4.1 * The structure and role of haemoglobin in the loading, transport and unloading of oxygen * The effects of carbon dioxide concentration on the dissociation of oxyhaemoglobin * The general pattern of blood circulation in a mammal * The gross structure of the human heart * Pressure and volume changes and valve movements during the cardiac cycle * The structure of the arteries, arterioles and veins * The formation of tissue fluid and its return to the circulatory system Topic 3.4.2 * Xylem as the tissue that transports water * The cohesion-tension theory of water transport * Phloem as the tissue that transports organic substances in plants * The mass flow hypothesis for the mechanism of translocation in plants If you would like to sample the quality of the lessons included in this bundle, then download the following lessons which have been uploaded for free Alveolar epithelium Absorption in the ileum Arteries, arterioles and veins Formation of tissue fluid Translocation

£24.00
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Mass transport (AQA A-level Biology)

This fully-resourced bundle includes 10 detailed PowerPoint lessons and their accompanying worksheets which cover the content as set out in topic 3.4 (Mass transport) of the AQA A-level Biology specification. This topic includes sections on mass transport in animals (3.4.1) and mass transport in plants (3.4.2). The lessons have been designed to include a wide range of tasks to maintain motivation whilst ensuring that the understanding of the content is constantly checked and links are made to other topics. The specification points in topic 3.4 which are covered in these lessons are: * The haemoglobins * The role of haemoglobin in the transport of oxygen * The oxyhaemoglobin dissociation curve * The Bohr effect * The general pattern of blood circulation in a mammal * The gross structure of the human heart * The valve movements in the cardiac cycle * The structure of the blood vessels * The formation of tissue fluid * The transport of water in the xylem * The structure of the phloem tissue * Translocation by mass flow If you would like to see the quality of these lessons, download the arteries, tissue fluid and translocation lessons as these have been uploaded for free

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Topic 3.4.1: Mass transport in animals (AQA A-level Biology)

Each of the 7 lessons in this bundle are fully-resourced and have been designed to cover the content as detailed in topic 3.4.1 (Mass transport in animals) of the AQA A-Level Biology specification. The specification points that are covered within these lessons include: * Haemoglobin and the role in the transport of oxygen * The effects of carbon dioxide concentration on the dissociation of oxyhaemoglobin * The general pattern of blood circulation in a mammal * The gross structure of the human heart * The calculation of cardiac output * Pressure and volume changes and valve movements during the cardiac cycle * The structure and function of arteries, arterioles and veins * The formation of tissue fluid The lessons have been written to include a wide range of activities and numerous understanding and prior knowledge checks so students can assess their progress against the current topic as well as be challenged to make links to other topics within this topic and earlier topics If you would like to see the quality of the lessons, download the blood vessels and the formation of tissue fluid lessons as these are free

£8.00

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