OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
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GCSE Biology · key term
Testing many substances to find any that affect a chosen biological target.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
For a sequence question, begin with identifying a biological target and screening many substances; do not begin with testing volunteers.
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