Combined Science (B) J260,05 Higher June 2019, OCR GCSE Past Papers with Mark Schemes

1. Cellular Respiration and Enzymes – Energy usage in active transport and muscle contraction, hydrogen peroxide breakdown by catalase, and the lock-and-key enzyme model.

2. Ecosystems and Food Webs – North Sea food chain dynamics, competition among predators, biodiversity changes due to fishing, and sustainability in herring populations.

3. Infectious Diseases and Immunity – Pathogen transmission, flu virus spread, probability of infection, vaccine development, and flu-related pneumonia risks.

4. Genetics and Inheritance – Huntington’s disease inheritance, protein synthesis from DNA, effects of mutations on proteins, and Punnett square probability calculations.

5. Circulatory and Nervous Systems – Sickle cell disease impact on oxygen transport, heart function stages, synapse role in nerve impulse transmission, and lung surface area ratio.

6. Plant Transport and Responses – Translocation in phloem, active transport vs. osmosis, effects of light on maggot movement, and preparing a microscope slide of a leaf section.