This lesson describes the methods used to test for reducing and non-reducing sugars and starch using Benedict’s solution and iodine/potassium iodide. The PowerPoint and accompanying resource are part of the first lesson in a series of 2 which have been designed to cover the content of point 2.1 (a) of the CIE A-level Biology specification.
The lesson begins with an explanation of the difference between a qualitative and quantitative test to allow the students to understand that the two tests described within this lesson indicate the presence of a substance but not how much. The students are likely to have met these tests during their studies at a lower level so this lesson has been planned to build on that knowledge and to add the knowledge needed at this level. A step by step guide walks the students through each stage of the tests for reducing and non-reducing sugars and application of knowledge questions are included at appropriate points to ensure that understanding is complete. Time is also taken to ensure that students understand the Science behind the results. The rest of the lesson focuses on the iodine test for starch and the students will learn that the colour change is the result of the movement of an ion into the amylose helix.
As this is the first lesson in topic 2 (Biological molecules), students are yet to learn about the structure and function of the carbohydrates which these tests detect. Therefore, included in the PowerPoint are numerous “LINK TO THE FUTURE” slides, where important details about the structure and function of the monosaccharides, disaccharides and polysaccharides are introduced.
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A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.
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Topics 1 & 2: Cell structure & Biological molecules (CIE A-level Biology)
It's no coincidence that cell structure and biological molecules find themselves as topics 1 and 2 of the CIE A-level Biology course, because a clear understanding of their content is absolutely critical to promote success with the 17 topics that follow. Hours and hours of intricate planning has gone into the 18 lessons included in this bundle to ensure that the detailed content is relevant and can be understood and that links are made to related sections of topics 3 - 19. The lesson PowerPoints and accompanying resources contain a wide range of activities that include: * differentiated exam-style questions with clear mark schemes * directed discussion points * quiz competitions to introduce key terms and values * current understanding and prior knowledge checks Due to the detail included in these lessons, it is estimated that it will take in excess of 2 months of allocated teaching time to cover the content of the resources A number of the resources have been shared for free so these can be downloaded in order to sample the quality of the lessons
£20.00
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Topic 2: Biological molecules (CIE International A-level Biology)
The biological molecules topic is incredibly important, not just because it is found near to the start of the course, but also because of its detailed content which must be well understood to promote success with the other 18 CIE International A-level Biology topics. Many hours of intricate planning have gone into the design of all of the 11 lessons that are included in this bundle to ensure that the content is covered in detail, understanding is constantly checked and misconceptions addressed and that engagement is high. This is achieved through the wide variety of tasks in the PowerPoints and accompanying worksheets which include exam-style questions with clear answers, discussion points, differentiated tasks and quick quiz competitions. The following specification points are covered by the lessons within this bundle: * Tests for reducing and non-reducing sugars * The iodine test for starch * The emulsion test for lipids * The biuret test for proteins * The ring forms of alpha and beta glucose * The meaning of the terms monomer, polymer, macromolecule, monosaccharide, disaccharide and polysaccharide * The formation of a glycosidic bond by a condensation reaction * The breakage of glycosidic bonds by hydrolysis reactions * The relationship between the molecular structure and functions of a triglyceride * The relationship between the structure and functions of a phospholipid * The structure of an amino acid and the formation and breakage of a peptide bond * The meaning of the different protein structures and the types of bonding that hold these molecules in shape * The molecular structure of haemoglobin and collagen as examples of globular and fibrous proteins * The relationship between the properties and roles of water in living organisms The lesson on the biuret test for proteins and the emulsion test for lipids also contains a section which can be used for the revision of topics 2.2 and 2.3 Due to the detail of each of these lessons, it is estimated that it will take in excess of 4 weeks of allocated teaching time to cover the content. If you would like to see the quality of the lessons, download the alpha and beta glucose, phospholipids and haemoglobin and collagen lessons as these have been shared for free
£15.00
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