Second year of A-level (A2)
A-level Biology Year 13 revision
Notes, diagrams and exam-style questions for every topic in A-level Biology Year 13, for AQA, OCR A, OCR B, Edexcel and Cambridge. The first part of each topic is free to read here, with practice questions and answers.
- 14 topics
- 87 subtopics
- 3,225 questions
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Topics
Topic 5Energy transfers in and between organismsEnergy transfers in and between organisms follows energy from sunlight, into the bonds of glucose, and through every living…8 subtopics · 271 questionsTopic 6Organisms respond to changes in their environmentsOrganisms respond to changes in their environments, and this topic shows exactly how, from plant hormones to the electrical…11 subtopics · 425 questionsTopic 7Genetics, populations, evolution and ecosystemsGenetics, populations, evolution and ecosystems connects what happens to single genes with what happens to whole populations…8 subtopics · 277 questionsTopic 8The control of gene expressionThe control of gene expression explains how the same set of genes can build a nerve cell, a muscle cell or a cancer cell.4 subtopics · 165 questionsTopic 9The nervous system, brain and sensory perceptionThe nervous system, brain and sensory perception takes you inside the most complex organ in the body.5 subtopics · 221 questionsTopic 10Homeostasis, excretion and hormonal communicationHomeostasis, excretion and hormonal communication is about how the body keeps its internal environment steady.8 subtopics · 262 questionsTopic 11Plant growth regulatorsPlant growth regulators shows how plants coordinate growth and respond to their environment without a nervous system.4 subtopics · 149 questionsTopic 12Genetic variation and selective breedingGenetic variation and selective breeding looks at where variation comes from and how humans use it.3 subtopics · 86 questionsTopic 13Ecological investigation and sustainabilityEcological investigation and sustainability brings together fieldwork, statistics and some of the biggest issues facing the…6 subtopics · 310 questionsTopic 14MicrobiologyMicrobiology is the study of microorganisms: how we grow them safely, count them, identify them, and fight them.7 subtopics · 256 questionsTopic 15Pathogens, disease and immunityPathogens, disease and immunity is about the constant contest between disease-causing organisms and the defences of plants and…7 subtopics · 247 questionsTopic 16Cloning and biotechnologyCloning and biotechnology looks at how plants and animals can be copied, and how microorganisms are put to work making food and…4 subtopics · 150 questionsTopic 17Regulation of gene expression in detailRegulation of gene expression in detail looks closely at how cells decide which genes to use, and when.5 subtopics · 162 questionsTopic 18Genetic technologiesGenetic technologies covers the tools that let scientists read, copy, cut and change DNA.7 subtopics · 244 questions