Cell Level Systems

Cell Structures

Light Microscopes

Cell Structure

Electron Microscopes

What Happens in Cells (& What do Cells Need?)

DNA Structure

The Mechanism of Enzyme Action

Respiration

Respiration is a Chemical Process

Aerobic & Anaerobic Respiration

Biological Molecules

Tests for Biological Molecules

Photosynthesis

Photosynthetic Organisms as Producers

The Effect of 3 Factors on Photosynthesis

Limiting Factors - Photosynthesis

Scaling Up

Supplying the Cell

Cellular Transport - Diffusion & Osmosis

Cellular Transport - Active Transport

Mitosis & the Cell Cycle

Cell Differentiation

Stem Cells in Animals & Plants

Embryonic & Adult Stem Cells in Animals

The Challenges of Size

Surface Area: Volume Ratio & Transport

Transport Into & Out of Organisms

The Heart

Blood Vessels

Blood Composition

Transport of Water & Mineral Ions in Plants

Transpiration & Translocation

Xylem & Phloem

Affecting Water Uptake by a Plant

Organism Level Systems

Coordination & Control – the Nervous System

The Nervous System - Structure

Generating a Nervous Response

The Reflex Arc

Coordination & Control – the Endocrine System

Hormonal Control

Hormones in Human Reproduction

Four Hormones in the Menstrual Cycle

Contraception

Hormones to Treat Infertility

Maintaining Internal Environments

Constant Internal Environment

Insulin in Blood Sugar Control

Glucagon in Blood Sugar Control

Responses to Extremes

Community Level Systems

Ecosystems

The Cycling of Materials

The Carbon Cycle

Levels of Organisation in an Ecosystem

Abiotic & Biotic Factors

Interdependence & Competition

Genes, Inheritance & Selection

Inheritance

The Genome & Genetics

Variation

Sexual Reproduction

Asexual Reproduction

Inheritance

Natural Selection & Evolution

Genetic Variation Within a Population

Evolution Through Natural Selection

Classification

Global Challenges

Monitoring & Maintaining the Environment

The Distribution & Abundance of Organisms

Human Interactions Within Ecosystems

Maintaining Biodiversity

Feeding the Human Race

Selective Breeding of Food Products

Genetic Engineering

The Process of Genetic Engineering

Biotechnology & Human Population

Monitoring & Maintaining Health

Health & Disease: Disease Types

Communicable Diseases

White Blood Cells & Platelets

Non-Specific Defences

The Human Immune System

Vaccines Against Disease

Developing New Medicines

Non-Communicable Human Diseases

Stem Cells in Medicine

Gene Technology in Medicine

Practical Skills

Practical Skills

Practical - Using Light Microscopes to View Cells

Practical - DNA Extraction

Practical - Sampling Techniques - Quadrats

Practical - Investigating Enzymatic Reactions

Practical - Investigating Photosynthesis

Practical - Using a Potometer

Practical - Measurement of Stomatal Density

Practical - Aseptic Technique

Practical - Surface Area: Volume Ratio

Practical - Investigating Osmosis

Study tools

• OCR GCSE Combined Science A (Gateway) · Exam Questions

Related links

• GCSE Science · Revision Notes
• GCSE Science · Exam Questions
• GCSE Science · Past Papers