AQA A level Biology Revision Questions and Answers 100% Pass

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AQA A level Biology Revision Questions and Answers 100% Pass Describe how you would use a biochemical test to show that a solution contained a non-reducing sugar, such as sucrose. [3] ✔✔,first ... reducing sugars test; boil with dilute HCl acid then Neutralise with NaHCǑ, add benedict and heat to 95 degrees C brick red ppt forms if reducing sugar is present Describe a chemical test you could carry out to show that a piece of coconut contains lipids. [3] ✔✔(Crush in) ethanol / alcohol; Add (to) water (Order of adding is critical for this point); Emulsion / white colour Explain what is meant by a polymer. [1] ✔✔Molecule) made up of many identical/similar molecules/monomers/ subunits; Name the reaction which occurs when starch is broken down into maltose. [1] ✔✔Hydrolysis What is the formula for lactose? [2] ✔✔C12 ; H22Ō1 Describe how β-glucose molecule differs from a molecule of α-glucose. [1] ✔✔H at top right end (instead of OH) / OH at bottom (carbon 1) Show two ways in which the structure of cellulose is different from the structure of starch. [2] ✔✔Starch 1,4 and 1,6 bonds / branching Cellulose 1 [Show More]

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