2 Question Acceptable Answer 9 (a) bases amino acids proteins all 3 = 2 marks 2/1 = 1 mark Proteins and Enzymes St Gr. (a) Biological washing powders contain enzymes. Explain how enzymes work to Marks remove stains. 2012 Q17(a) & (c) 2 (c) Biological washing powders contain different enzymes. Explain why this is necessary. 1 Question Acceptable Answer Not Mark acceptable 17 (a) react with stains Digest stains / breakdown stains 1 Makes stains more soluble / so stains can be washed 1 out
2 Question Acceptable Answer 9 (a) bases amino acids proteins all 3 = 2 marks 2/1 = 1 mark Proteins and Enzymes St Gr. 2012 Q17(a) & (c) (a) Biological washing powders contain enzymes. Explain how enzymes work to remove stains. Marks 2 (c) Biological washing powders contain different enzymes. Explain why this is necessary. 1 Question Acceptable Answer Not acceptable Mark 17 (a) Digest stains / breakdown stains Makes stains more soluble / so stains can be washed out react with stains 1 1
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