Flashcards
AQA Biology 2.3 Carbohydrates - disaccharides and polysaccharides
Flashcards do conjunto (31)
- 1what name is given to one monomer?monosaccharide
- 2what name is given to a pair of monosaccharide's?disaccharides
- 3what is the name given to larger numbers of monosaccharide's?polysaccharides
- 4what three substances can be formed by a disaccharide?maltose, sucrose and lactose
- 5how id maltose formed?Glucose+glucose
- 6how is sucrose formed?Glucose + fructose
- 7how is lactose formed?Glucose + galactose
- 8what happens when monosaccharide's join?a molecule of water is removed
- 9what is the name for this reaction?condensation reaction
- 10what is the name of the bond formed?glycosidic bond
- 11how can you break this bond?add water
- 12what does this do?releases the constituent monosaccharide's
- 13what is this process called?hydrolysis reaction
- 14what do you use to test for reducing sugars?Benedict's test
- 15what must be done to test for a non-reducing sugar?it must be broken down into its monosaccharide components by hydrolysis
- 16what is done first to check the sample?goes through benedict's test. if no colour change, its a non-reducing sugar
- 17what do you then add to the sample?dilute hydrochloric acid
- 18what do you do to this mix?put it in gently boiling water for 5 mins
- 19what will this acid do?hydrolyse the disaccharides into monosaccharides
- 20what do you then add?sodium hydrogencarbonate solution
- 21why do you do this?to neutralise it as Benedict's reagent wont work in acidic conditions
- 22how do you check that the solution is neutralised?test with pH paper
- 23what is the next step?re-test by heating with benedict's reagent
- 24what will happen if non-reducing sugar was present in original sample?benedict's solution will go orange-brown.
- 25why does this happen?reducing sugars were produced from the hydrolysis of non-reducing sugars
- 26what feature makes polysaccharides suitable for storage?insoluble
- 27what is an example of a polysaccharide found in plants?starch
- 28what is it found in the form of?small granules or grains
- 29how is starch formed?linking between 200 and 100,000 alpha-glucose molecules
- 30how do you test for starch?add iodine solution and stir/shake
- 31what will happen if starch is present?solution will go from yellow to blue-black
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- AS - Level AS Biology (unit 1 - 02. enzymes and the digestive system) FlashCards sobre AQA Biology 2.3 Carbohydrates - disaccharides and polysaccharides, criado por Charlotte Hewson em 27-04-2015.
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