IB Biology (first exams 2025) notes for Theme A, by syllabus code.
Home › IB Biology › Cell biology › Origin and evolution of cells Origin and Evolution of Cells The origin of cells is how the first living cells arose from non-living chemicals, about 3.5 to 4 billion years ago. Organic molecules probably formed self-replicating RNA inside membrane vesicles. The last universal common ancestor (LUCA) gave […]
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Home › IB Biology › Cell biology › Cell structure Cell Structure: Prokaryotic, Plant and Animal Cells Cell structure is the arrangement of the parts that make up a cell. Every cell has a plasma membrane, cytoplasm, ribosomes and DNA. Prokaryotic cells, such as bacteria, have no nucleus and no membrane-bound organelles, while eukaryotic cells,
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Home › IB Biology › Cell biology › Microscopy Microscopy: Light and Electron Microscopes Microscopy is the use of microscopes to see objects too small for the naked eye. Magnification is how many times larger the image is than the real object (image size ÷ actual size); resolution is the smallest distance at which two
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Home › IB Biology › Cell Biology › Introduction to Cells Introduction to Cells A cell is the smallest unit that can carry out every process of life. Cell theory says that all organisms are made of cells, that the cell is life’s basic unit, and that cells only come from existing cells. All cells
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