OCR-A A-Level Biology 2026: Paper 1 Predictions 🧬🔮

Hello, future biologists! 👋 Are you ready to smash your A-Level Biology exams this year? We know revision can feel a bit overwhelming at times (so much to remember! 🤯), but remember: you are capable, you are prepared, and you’ve got this! 🌟

It is so important to look after your mental health during exam season. Take breaks, drink plenty of water 💧, and get some fresh air 🌳. A calm brain is a clever brain!

⚠️ A Quick Reminder Before We Start

Please remember to review the entire specification. As much as we’d love to have a crystal ball 🔮, we haven't seen the exams! These predictions are based on our analysis of past trends, but anything in the specification could come up. Think of these topics as your "revision power list"—areas we think are highly likely to appear, but not an exclusive list.

🚀 Boost Your Revision

Want to feel extra confident walking into that exam hall?

• 📥 Download our Predicted Papers: They are designed to mirror the real exam style.

• 📝 Use our Unlimited Free Notes: Perfect for filling in any gaps in your knowledge.

• 🧠 Take Retrieval Quizzes: The best way to make those facts stick!

• How Accurate Are Predicted Papers? 🎯

• How Do We Write Our Predicted Papers? ✍️

• Join thousands of happy students! Check out our Reviews Page (Over 1,000 5-star reviews! ⭐⭐⭐⭐⭐)

📚 Revision Guide: Top Predictions for 2026

This list covers topics we expect for Paper 1 (Biological Processes) or Paper 3 (Unified Biology) (H420).

MCQs on Any Topic! 🎲

Be ready for anything in Paper 1 Section A! Multiple-choice questions can test minute details from across topics 1, 2, 3 and 5.

🦠 Cells, Exchange & Transport (Modules 2 & 3)

Heart Structure and Function 🫀

Know your way around the heart anatomy: Atria, ventricles, septum, and the major vessels (aorta, vena cava, pulmonary arteries/veins). Crucially, understand the cardiac cycle (systole/diastole) and how the valves (AV and SL) work to prevent backflow. Don't forget the electrical conduction system (SAN, AVN, Purkyne tissue) and how to interpret an ECG trace!

Tissue Fluid 💧

You need to explain how tissue fluid is formed from plasma. Focus on the interplay between hydrostatic pressure (forcing fluid out at the arterial end) and oncotic pressure (pulling fluid back in by osmosis due to plasma proteins). Know where the excess fluid goes (lymphatic system).

Membrane Structure 🧱

The fluid mosaic model is key. Be able to draw and label phospholipids, cholesterol, glycolipids/proteins, and intrinsic/extrinsic proteins. Understand cell signalling and how receptors work.

Transport Across Membranes (including Osmosis PAG) 🌊

Revise diffusion, facilitated diffusion, active transport, and osmosis. For the PAG, recall how to calculate water potential using potato cylinders (or similar tissue) and calibration curves.

SA:V (Surface Area to Volume Ratio) 📏

Small organisms have a large SA:V ratio and can rely on diffusion; large organisms need transport systems. Be ready to calculate this ratio and explain why it limits cell size.

Plant Transport (including Transpiration PAG) 🌿

Understand the structure of xylem (lignified, hollow) and phloem (sieve tube elements, companion cells). Revise the cohesion-tension theory for water transport and the potometer practical for measuring transpiration rates (don't forget the air bubble!).

Gas Exchange (Focus on Insects) 🦗

Insects don't use blood for gas exchange! Revise the tracheal system: spiracles, tracheae (chitin rings), and tracheoles (where gas exchange happens). Mention how abdominal contractions (ventilation) can increase air flow.

Cell Structure & Microscopes 🔬

Compare prokaryotic vs. eukaryotic cell structure. Know your organelles and their functions (RER, SER, Golgi, Lysosomes, etc.). Be comfortable with magnification formulas (Magnification = Image Size / Actual Size) and the difference between magnification and resolution (and SEM vs TEM microscopes).

Mitosis and the Cell Cycle 🔄

Know the stages: Interphase (G1, S, G2), Mitosis (PMAT), and Cytokinesis. Be able to identify stages from micrographs and explain the importance of checkpoints.

Meiosis 🧬

How does it produce variation? Focus on crossing over (Prophase I) and independent assortment (Metaphase I & II).

DNA Replication 🧬

Semi-conservative replication is a must-know. Remember the roles of DNA helicase (breaking hydrogen bonds) and DNA polymerase (joining nucleotides).

⚡ Biochemistry & Metabolism (Modules 2 & 5)

ATP Structure and Function 🔋

The universal energy currency! It's a nucleotide derivative (adenine, ribose, 3 phosphates). Know how energy is released via hydrolysis.

Enzymes (including Cofactors) 🧩

Revise the induced-fit model. Understand how temperature, pH, enzyme concentration, and substrate concentration affect rate. Don't forget inhibitors (competitive vs non-competitive) and cofactors/coenzymes (like Cl⁻ for amylase or NAD/FAD).

Protein Synthesis 🏗️

Transcription (in the nucleus) and Translation (at the ribosome). Be clear on the roles of RNA polymerase, mRNA, tRNA.

Lipid Structure and Function 🧈

Triglycerides (energy storage) vs. Phospholipids (membranes). Know the difference between saturated and unsaturated fatty acids.

Food Tests 🧪

Recall the qualitative tests and how to carry them out: Biuret (proteins), Benedict's (reducing/non-reducing sugars), Emulsion (lipids), and Iodine (starch).

Respiration (Focus on Anaerobic & Respirometers) 🏃

Aerobic is important, but anaerobic is a hot topic prediction! Compare lactate fermentation (mammals) vs. ethanol fermentation (yeast). For the respirometer practical, know how to measure oxygen uptake using KOH to absorb CO₂ and how to calculate RQ values.

Photosynthesis (Focus on Light Independent Reaction) ☀️

The Calvin Cycle! Know the steps: Carbon fixation (RuBP + CO₂ + Rubisco), Reduction (GP to TP using ATP & reduced NADP), and Regeneration of RuBP. Know that TP is the starting point for glucose, lipids, and amino acids.

🧠 Control & Homeostasis (Module 5)

Nervous System (including the Brain) 🧠

Gross structure of the brain (Cerebrum, Cerebellum, Medulla Oblongata, Hypothalamus, Pituitary). Know their basic functions.

Neuromuscular Junction and Synapses ⚡

How does a nerve impulse cross a gap? Calcium channels, vesicle fusion, acetylcholine, neurotransmitter receptors, and acetylcholinesterase. Compare the neuromuscular junction to a standard cholinergic synapse.

Temperature Control 🌡️

Ectotherms vs Endotherms. Homeostasis involves negative feedback. Mechanisms: vasodilation/constriction, shivering, sweating, and the role of the hypothalamus.

Plant Hormones (including PAG) 🌱

Auxins (cell elongation, apical dominance) and Gibberellins (germination, stem elongation), plus Abscisic acid (stomatal closure) and Ethene (fruit ripening). For the PAG: investigating geotropism/phototropism with cress or similar.

Blood Glucose Control 🍭

The Islets of Langerhans in the pancreas: Alpha cells (Glucagon) and Beta cells (Insulin). Understand the mechanism of action on liver cells (glycogenesis, glycogenolysis, gluconeogenesis).

Liver Histology and Function 🍷

Know the structure of the liver lobule: central vein, hepatocytes, sinusoids, and the triad (hepatic artery, portal vein, bile duct). Key functions: deamination (ornithine cycle) and detoxification.

Kidney Histology and Function 🚽

The nephron: Ultrafiltration (Bowman’s capsule/Glomerulus), Selective Reabsorption (PCT), Water reabsorption (Loop of Henle & Counter-current multiplier), and Osmoregulation (DCT/Collecting duct & ADH).

📝 Exam Structure Breakdown

Paper 1: Biological Processes 🦠

• Total Marks: 100

• Time: 2 hours 15 minutes

• Content: Modules 1, 2, 3, and 5.

• Format:

  • Section A: 15 marks of Multiple Choice Questions (MCQs).

  • Section B: 85 marks of short answer and extended response questions.

Paper 3: Unified Biology 🌍

• Total Marks: 70

• Time: 1 hour 30 minutes

• Content: All Modules (1 to 6). This paper tests your ability to make links between different parts of the specification.

• Format:

  • Section A: Short answer and extended response questions.

  • Section B: Practical application questions (analysis of data, experimental design).