IB Biology Question Bank
Practice by topic with exam-style IB Biology questions aligned with the syllabus.
A1.1
Water
Polarity, Hydrogen bonds, Cohesion, Adhesion, Solvent properties, Aquatic habitats, Goldilocks zone
A1.2
Nucleic acids
DNA and RNA, Nucleotides, Complementary base pairing, Genetic code, Nucleosomes, Hershey–Chase, Chargaff
A2.1
Origins of cells
Pre-biotic chemistry, Protocells, RNA world, LUCA, Hydrothermal vents
A2.2
Cell structure
Cell theory, Microscopy, Prokaryotes and eukaryotes, Ultrastructure, Endosymbiosis, Differentiation
A2.3
Viruses
Capsids, Viral genomes, Lytic and lysogenic cycles, Obligate parasitism, Viral origins, Rapid evolution
A3.1
Diversity of organisms
Species concepts, Binomial names, Chromosome diversity, Karyograms, Genome variation, Sequencing, Barcoding
A3.2
Classification and cladistics
Taxonomy, Clades, Molecular clocks, Cladograms, Parsimony, Three domains
A4.1
Evolution and speciation
Heritable change, sequence evidence, homologous and analogous structures, reproductive isolation, speciation, adaptive radiation, polyploidy
A4.2
Conservation of biodiversity
Biodiversity levels, Sixth mass extinction, Ecosystem loss, Evidence and surveys, Conservation strategies, EDGE prioritization
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