A-Level AQA Biology Videos

Biological Molecules

Monomers & Polymers

Proteins

The Structure and Function of Proteins

The Enzyme Question

Nucleic Acids

DNA Replication

Cells

All Cells Arise from Other Cells

Cell Division: Mitosis

Transport Across Cell Membranes

Transport Across Membranes

Cell Recognition & Immunity

The Immune System: Phagocytosis

The Immune System: T cells and B cells

Organisms Exchange Substances

Gas Exchange

Gas Exchange in Insects and Fish

Mass Transport

Structure of the Human Heart

Haemoglobin and Bohr Effect

Mass Transport in Plants: Xylem

Genetic Information & Variation

DNA, Genes & Chromosomes

DNA is Universal

DNA & Protein Synthesis

Protein Synthesis: Transcription

Protein Synthesis: Translation

Genetic Diversity & Adaptation

Directional and Stabilising Selection

Species & Taxonomy

Species and Taxonomy

Energy Transfers

Photosynthesis

An Introduction to Photosynthesis

Respiration

Respiration: Glycolysis

Respiration: Krebs Cycle

Energy & Ecosystems

Nutrient Cycles

The Nitrogen Cycle

Responses to Environmental Change

Responses to Stimuli

Plant Responses: Growth Factors

Nervous Coordination

The Pacinian Corpuscle

Control of Heart Rate

The Nervous System: Action Potentials

Skeletal Muscle Contraction

Muscles: Sliding Filament Theory

Homeostasis

Homeostasis: The Kidneys

Genetics, Populations & Evolution

Inheritance

Monohybrid Inheritance

Inheritance: Autosomal Linkage

Evolution & Speciation

Allopatric & Sympatric Speciation

Populations in Ecosystems

Abundance & Distribution of Organisms

The Control of Gene Expression

DNA Mutations & Protein Structure

Control of Gene Expression

Transcription Factors

Gene Technologies

Gene Technology: Isolating Target Genes

Gene Technology: Genetic Fingerprinting