OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Detection and IdentificationUnwanted microorganisms must not enter the sample: contamination could produce misleading observations or cultures. Detailed aseptic techniques are considered separately, but their purpose here is to preserve the reliability of the evidence.
- Revise: Aseptic Techniques
The growth of microorganisms in a prepared medium so that they can be studied.
- Revise: Calculating Bacterial Areas
A population of microorganisms grown under controlled conditions, such as bacteria growing on agar jelly.