Why do cells divide?, What causes cancerous tumours?, Where are DNA and genes found?, What is the term we use to describe the shape of DNA?, How does DNA help identify people?, What is an enzyme?, What do enzymes do to a chemical reaction?, Why are micro-organisms useful to humans?, Name 3 limiting factors of photosynthesis?, Describe genetic engineering?, Why is genetic engineering controversial?, Give two examples of a product made from micro-organisms.

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