Flashcards
AQA biology 2.2 Carbohydrates - monosaccharides
Cards in this deck (21)
- 1what allows carbon atoms to build up?they readily form bonds with other carbon atoms
- 2what is the name given to given to each of the individual molecules that make up a chain?monomers
- 3what is the longer chain made up of repeating monomer units called?polymer
- 4what 4 elements are most polymers made up of?-carbon
-hydrogen
-oxygen
-nitrogen - 5what is the basic monomer unit in carbohydrates?a sugar
- 6what is another name for this?a saccharide
- 7so what is a single monomer called?monosaccharide
- 8what is formed by a pair of monosaccharides?a disaccharide
- 9what do three or more monosaccharides join to form?polysaccharides
- 10what is the general formula for monosaccharides?( CH(2) O ) (n)
- where n can be any number between 3 to 7 - 11how many carbons does glucose have? what is the name for this?- 6 carbon
- hexose sugar - 12what shape do the atoms form in their molecular arrangement?a ring
- 13which saccharides are reducing sugars?all monosaccharides and some disaccharides e.g. maltose
- 14what does a reduction involve?gaining electrons
- 15what is a reducing suger?a sugar that can donate electrons to (or reduce) another chemical
- 16what test is done to test for a reducing sugar?benedicts test
- 17what is gaining the elsectron in this test?the Benedicts reagent
- 18what is benedicts reagent?an alkaline solution of copper (II) sulfate
- 19what happens when a reducing sugar is heated with benedicts reagent?it forms an insoluble red precipitate of copper (I) oxide
- 20how is the test carried out?-add the food sample to a test tube. if not in liquid form, grind it up
-add an equal volume of benedicts reagent
-heat the mixture in a gently boiling water bath for 5 mins - 21what are the concentrations depending on the colour?none = blue
very low = green
low = yellow
medium = brown
high = red
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- AS - Level AS Biology (unit 1 - 02. enzymes and the digestive system) Flashcards on AQA biology 2.2 Carbohydrates - monosaccharides , created by Charlotte Hewson on 13/04/2015.
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