OCR As Biology B Paper 1 2025 Mark Scheme Pdf

Get the official OCR AS Level Biology B (Advancing Biology) H022/01 Foundations of Biology mark scheme from the June 2025 examination series. This examiner-approved PDF contains the exact mark allocations, indicative scientific points, examiner annotations, practical-skills guidance, calculation methods, and assessment-objective breakdowns used during live Summer 2025 OCR marking.

This mark scheme provides detailed examiner guidance for questions covering apoptosis, HIV infection, transport systems, bronchiectasis, chronic disease, tRNA structure, ATP hydrolysis, DNA replication, transcription rates, phylogenetic trees, communicable diseases, dynamin proteins, endocytosis, flow cytometry, haemocytometer calculations, algal biovolume calculations, and Euglena ultrastructure. It includes accepted alternative answers, calculation tolerances, practical-method expectations, annotation conventions, and OCR marking principles used by examiners in the live 2025 series. Pair it with the matching OCR H022/01 June 2025 question paper on markscheme.net for complete examiner-style revision and exam preparation. Updated for the 2025/2026 academic year, mobile-friendly, and instantly downloadable from markscheme.net.

This document is designed for OCR AS Level Biology B (Advancing Biology) students preparing for the 2026 examination series, Year 12 learners studying Foundations of Biology, retake students targeting A/A grades, and home-schooled candidates seeking examiner-level insight into OCR marking expectations.

It is also essential for teachers, private tutors, revision-course providers, and parents supporting Biology revision at home. The mark scheme can be used for mock-exam grading, practical-skills assessment, data-analysis evaluation, exam-technique improvement, and identifying weaknesses in OCR AS Biology B responses.