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  1. AS Level
  5. Lessons

Biology Lessons

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Step-by-step AQA AS Level Biology lessons by topic, building up to exam-style questions.

Biological molecules

Monomers and polymers

Lipids

Proteins

Nucleic acids are important information-carrying molecules

ATP

Water

Inorganic ions

Cells

Cell structure

All cells arise from other cells

Transport across cell membranes

Cell recognition and the immune system

Organisms exchange substances with their environment

Surface area to volume ratio

Gas exchange

Digestion and absorption

Mass transport

Genetic information, variation and relationships between organisms

DNA, genes and chromosomes

DNA and protein synthesis

Genetic diversity can arise as a result of mutation or during meiosis

Genetic diversity and adaptation

Species and taxonomy

Biodiversity within a community

Investigating diversity