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This 44-page Edexcel IAL Biology Unit 5 (WBI15/01) Master Revision Guide provides complete specification coverage for Respiration, Internal Environment, Coordination and Gene Technology. Aligned with the 2019–2025 exam series and based on Principal Examiner Reports (2020–2024), this resource includes unique guidance for the pre-released scientific article – worth approximately 20% of the paper.

Last updated with insights from the June 2024 exam series, this guide covers all critical topics and the most penalised errors across 10 sittings.

What’s inside?

Priority heatmap – Red-rated topics appear in every sitting: sliding filament theory (correct order), chemiosmosis/ETC, ADH mechanism, action potential, and genetic engineering.

Top 15 penalised errors

Pre-released scientific article guide – How to study the article (3-read method), map terms to specification topics, and answer article questions using the three-step structure (trend → biological explanation → link to context). Covers PCR, gel electrophoresis, microarrays, MRI/PET/CT scans, and bioinformatics.

Mathematical skills module – Worked examples for standard form (1.6×10⁴ not 16000), unit conversions (cm³→dm³, mm→μm), percentage change (divide by original), cardiac output, ratios (x:1 format), and rounding to whole numbers (no fractions of a cell/organism).

Model answers – 4-mark sliding filament theory, 4-mark action potential (toxin mechanism), and 3-mark genetic engineering – all with examiner commentary.

Exam predictions – High-confidence predictions

How I use this resource:

For teachers – Use diagnostic activities (Section 14.1) to identify weakness profiles (respiration gaps, muscle order errors, calculation mistakes). The common misconceptions register (14.2) targets the most persistent errors across all series.

Independently produced by Samata Reviews. Not affiliated with or endorsed by Pearson Education Limited.

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