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Biology 4BI1/2B January 2020 | Edexcel International GCSE Past Papers With Mark Scheme

1. Tuberculosis and Disease Transmission: Bovine TB in cattle, spread through inhalation and unpasteurized milk, impact on gas exchange, and effectiveness of vaccination and culling in badger populations.

2. Transpiration and Water Movement: Importance of transpiration for plants, experimental setup for measuring water loss under different conditions, and factors affecting transpiration rates.

3. Human Circulatory System and Heart Function: Structure and function of the ventricles, effects of reduced blood supply on heart muscle tissue, and role of stem cells in repairing heart damage.

4. Genetics and DNA Structure: Differences between DNA and RNA, processes of transcription and translation, minimum base pairs required for coding amino acids, and protein synthesis mechanisms.

5. Kidney Function and Homeostasis: Ultrafiltration in the nephron, ADH regulation of permeability, correlation between birth mass and nephron count, and detection of protein in urine as a sign of kidney disease.

6. Microbiology and Biotechnology: Use of fermenters for microorganism growth, function of paddles in aeration, importance of filtered air supply, and the role of temperature regulation in fermentation processes.
Edexcel International GCSE Biology (4BI1) Jan 2020

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Classification: Edexcel Paper 2
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