OCR GCSE Biology A Gateway Paper 3 Higher 2025 Mark Scheme

This is the official June 2025 mark scheme for OCR GCSE Biology A Gateway, Paper 3 Higher Tier (J247/03). It contains the complete marking guidance, accepted answers, alternative responses, and assessment objective breakdowns for all 23 questions, including the Section A multiple-choice questions and the extended-response level-of-response question on designing a catalase and hydrogen peroxide investigation.
Use this mark scheme alongside the question paper to check your answers, understand how marks are awarded, and identify common pitfalls. It covers core Higher Tier topics including the eye and vision correction, mitosis and cell division, DNA structure and protein synthesis (transcription and translation), photosynthesis, enzymes and the lock-and-key model, the kidney and ADH, the menstrual cycle, type 2 diabetes and HbA1c, and the brain and Parkinson's disease.

This mark scheme is for GCSE students sitting OCR Biology A Gateway (Higher Tier) who want to self-mark Paper 3 and revise effectively for their exams. It is also a valuable resource for teachers preparing lessons and revision sessions, tutors providing one-to-one support, and parents helping their children prepare for GCSE Biology. Anyone working through the J247/03 June 2025 paper will find this essential for accurate marking.