Disaccharides are formed from the condensation of two monosaccharides and this lesson describes the formation of maltose, sucrose and lactose. The PowerPoint and accompanying question sheet have been designed to cover the second part of point 1.2 of the AQA A-level Biology specification but also make links to the previous lesson on monosaccharides when considering the different components of these three disaccharides.
The first section of the lesson focuses on a prefix and a suffix so that the students can recognise that the names of the common disaccharides end in -ose. In line with this, a quick quiz round is used to introduce maltose, sucrose and lactose before students are challenged on their prior knowledge as they have to describe how condensation reactions and the formation of glycosidic bonds were involved in the synthesis of each one. The main task of the lesson again challenges the students to recall details of a previous lesson as they have to identify the monomers of each disaccharide when presented with the displayed formula. Time is taken to show how their knowledge of these simple sugars will be important in later topics such as digestion, translocation in the phloem and the Lac Operon in the control of gene expression. The lesson finishes with two exam-style questions where students have to demonstrate and apply their newly acquired knowledge
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Topic 1: Biological molecules (AQA A-level Biology)
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Topic 1.2: Carbohydrates (AQA A-level Biology)
This bundle contains a series of 4 lessons which have been designed to cover the content of topic 1.2 of the AQA A-level Biology specification. Prior knowledge check questions are written into each of the lessons to promote continuity and to encourage students to make links between topics. The wide variety of tasks that are included within the lesson PowerPoints and the accompanying resources cover the following specification points: * Monosaccharides are the monomers from which larger carbohydrates are made * Glucose, galactose and fructose as the common monosaccharides * Maltose, lactose and sucrose are formed by the condensation of two monosaccharides where the reaction forms a glycosidic bond * Glucose has two isomers * Glycogen and starch are formed by the condensation of alpha-glucose * Cellulose is formed by the condensation of beta-glucose * The basic structure and functions of glycogen, starch and cellulose * The use of Benedict's solution to test for reducing and non-reducing sugars * The use of iodine/potassium iodide to test for starch If you would like to sample the quality of this lesson bundle, then download the polysaccharides lesson as this has been uploaded for free
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