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Creado por Charlotte Hewson
hace más de 9 años
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Pregunta | Respuesta |
what name is given to one monomer? | monosaccharide |
what name is given to a pair of monosaccharide's? | disaccharides |
what is the name given to larger numbers of monosaccharide's? | polysaccharides |
what three substances can be formed by a disaccharide? | maltose, sucrose and lactose |
how id maltose formed? | Glucose+glucose |
how is sucrose formed? | Glucose + fructose |
how is lactose formed? | Glucose + galactose |
what happens when monosaccharide's join? | a molecule of water is removed |
what is the name for this reaction? | condensation reaction |
what is the name of the bond formed? | glycosidic bond |
how can you break this bond? | add water |
what does this do? | releases the constituent monosaccharide's |
what is this process called? | hydrolysis reaction |
what do you use to test for reducing sugars? | Benedict's test |
what must be done to test for a non-reducing sugar? | it must be broken down into its monosaccharide components by hydrolysis |
what is done first to check the sample? | goes through benedict's test. if no colour change, its a non-reducing sugar |
what do you then add to the sample? | dilute hydrochloric acid |
what do you do to this mix? | put it in gently boiling water for 5 mins |
what will this acid do? | hydrolyse the disaccharides into monosaccharides |
what do you then add? | sodium hydrogencarbonate solution |
why do you do this? | to neutralise it as Benedict's reagent wont work in acidic conditions |
how do you check that the solution is neutralised? | test with pH paper |
what is the next step? | re-test by heating with benedict's reagent |
what will happen if non-reducing sugar was present in original sample? | benedict's solution will go orange-brown. |
why does this happen? | reducing sugars were produced from the hydrolysis of non-reducing sugars |
what feature makes polysaccharides suitable for storage? | insoluble |
what is an example of a polysaccharide found in plants? | starch |
what is it found in the form of? | small granules or grains |
how is starch formed? | linking between 200 and 100,000 alpha-glucose molecules |
how do you test for starch? | add iodine solution and stir/shake |
what will happen if starch is present? | solution will go from yellow to blue-black |
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