Biology_7401 Marking Scheme Paper 2. Last document update:   ago

Biology_7401 Marking Scheme Paper 2. Question Marking Guidance Mark Comments 01.1 1. Select at random; 2. Large sample/number (of snails)/>10; 2 1. Accept description of random technique 2. Ignore ‘many’ 01.2 Mean and standard deviation; 1 Accept 2 correct statistical values for 1 mark Accept any order Accept average for mean Accept standard error for standard deviation Accept interquartile range 01.3 (Littorina -) genus and (littorea -) species; 1 Accep...

Biology_7401 Marking Scheme Paper 1. Last document update:   ago

Biology_7401 Marking Scheme Paper 1. Question Marking Guidance Mark Comments 01.1 Letter Statement B; is a monomer in an enzyme’s active site D; is a monomer in cellulose C; is produced during photosynthesis and respiration B; forms a polymer that gives a positive result with a biuret test 4 Must be in correct order 01.2 C = 18, H = 32, O = 16; 1 Accept only these answers 01.3 1. Heat with acid and neutralise; 2. Heat with Benedict's (solution); 3. Red precipi...