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AS-U1-2.2 carbohydrates-monosaccharides

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AS-U1-2.2 carbohydrates-monosaccharides

  1. 1. 1. Sufferers of bowel cancer sometimes have to have part of their small intestines removed to prevent the cancer from spreading. Suggest one symptom a person may experience from this. Give a reason for your answer. 2. Antacids can be taken to treat indigestion. Antacids work by neutralising excess stomach acid. Suggest how taking antacids may have an effect on digestion.
  2. 2. Carbohydrates- Monosaccharides Objective: To understand how carbohydrates are made up of simple units know as monosaccharides. Outcomes: ~ Describe what a monosaccharide is and name examples. ~ Explain how to carry out a test for reducing sugars. Sunday, 28 September 2014 Keywords Monomer Polymer Monosaccharide Reducing sugar Benedict’s
  3. 3. Main function in the body? Energy Named examples? Starch, glucose, glycogen Carbohydrates? What enzymes help to digest them? Carbohydrases e.g. amylase Chemical elements? Carbon Hydrogen Oxygen
  4. 4. Monomers and polymers Carbohydrates are polymers. An individual molecule is a monomer in this case a sugar, monosaccharide. Polysaccharide
  5. 5. Monosaccharides ~ Sweet tasting, soluble substances. ~ e.g. Glucose, C6H12O6 ~ Fructose and galactose ~ respiration
  6. 6. Biochemical test • All monosaccharides and some disaccharides are reducing sugars. Reduction reaction involves electrons being gained. The reducing sugars donate electrons to another chemical, copper (II) sulphate or Benedict’s solution.  Forming red precipitate of copper (I) oxide
  7. 7. Test for reducing sugars 1. Add 2cm³ of food sample (in liquid form) to a test tube. 2. Then add 2cm³ of Benedict’s Reagent. 3. Heat mixture in gentle boiling water bath for 5mins. Benedict’s Test [Reducing sugar] Results Colour of solution and precipitate None Blue Very low Green Low Yellow Medium Brown High Red
  8. 8. Useful Link www.biochemistry.org Downloadable biochemistry booklets

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