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A-Level Biology OCR A

Cells Extracellular Role Enzymes Raw Materials Nutrients Explain

Extracellular enzymes break down large nutrient molecules (polymers) into smaller, absorbable units for cells.

Extracellular enzymes digest large nutrient molecules (polymers) from the diet or environment into smaller molecules that cells can absorb and utilize.

Front Explain the role of extracellular enzymes in general. 
Back Role of extracellular enzymes:
  • Reactions in cells require raw materials to make products required by organisms which have to be constantly supplied to cells
  • Nutrients present in diet/environment are the supply for the raw materials
  • Nutrients are often in the form of polymers (proteins and polysaccharides) that cant enter cells directly
  • Extracellular enzymes are used to digest them into smaller molecules so that they can be absorbed and used by cells

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