Topics for B7 ideas in context list OCR 21st century science GCSE 2011

best to revise form B2 ( keeping healthy)- 

• how clinical tests ( epidemiological studies) are conducted- (advantages and disavantages of each type)
• Sampling 
• peer review
• reliability and accuracy 
• correlations

From B5 Growth and development

• mitosis
• how protiens are made
• structure of DNA