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 (c) Different types of stains require different enzymes to Enzymes 1 digest them / One enzyme cannot digest all types of are stains / Enzymes are specific to particular stains / For specific different types of stains (Answer must refer to stains)
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 (c) Different types of stains require different enzymes to digest them / One enzyme cannot digest all types of stains / Enzymes are specific to particular stains / For different types of stains (Answer must refer to stains) Enzymes are specific 1