Biology > AQA QUESTION and MARK SCHEMES > AQA_A-level_Biology_Paper_1_MARK SCHEME 2022 (All)
AQA_A-level_Biology_Paper_1_MARK SCHEME 2022
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A-LEVEL BIOLOGYMARK SCHEME Practice Paper 1 1 (a)(i)fructose; 1 (ii)correctly drawn (OH group at bottom left);1 (b)hydrolysis;1 (c)(i)heat with Benedict’s solution (disqualify if HCl added); or... ange / brown / brick red / green / yellow colour or precipitate; 2 (ii)biuret test / NaOH + CuSO4;purple / violet / lilac / mauve;2 (d)Starch (max 3) 1.Context of storage for starch, structure for cellulose 2.Helical/ spiral shape so compact; 3.Large (molecule)/insoluble so osmotically inactive; Accept: does not affect water potential/ψ. 4.Branched so glucose is (easily) released for respiration; Ignore: unbranched. 5.Large (molecule) so cannot leave cell/cross cell-surface membrane; Cellulose (max 3) 5.Long, straight/unbranched chains of β glucose; 6.Joined by hydrogen bonding; Note: references to ‘strong hydrogen bonds’ disqualifies this mark point. 7.To form (micro/macro)fibrils; 8.Provides rigidity/strength; [Show More]
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