UNIT 1 Cells and the
Origin of Life
Unit Outline
IB Roadmap: A2
Unity and Diversity
Common ancestry has given living organisms many shared features while evolution has resulted in the rich biodiversity of life on Earth.
Syllabus Statements
A2.1.1 AHL Conditions on Early Earth and the pre-biotic formation of carbon compounds
A2.1.2 AHL Cells as the smallest units of self-sustaining life
A2.1.3 AHL Challenge of explaining the spontaneous origin of cells
A2.1.4 AHL Evidence for the origin of carbon compounds
A2.1.5 AHL Spontaneous formation of vesicles by coalescence of fatty acids into spherical bilayers
A2.1.6 AHL RNA as a presumed first genetic material
A2.1.7 AHL Evidence for a last universal common ancestor
A2.1.8 AHLApproaches used to estimate dates of the first living cells and the last universal common ancestor
A2.1.9 AHL Evidence for the evolution of the last universal common ancestor in the vicinity of hydrothermal vents
A2.2.1 Cells as the basic structural unit of all living organisms
A2.2.2 Microscopy skills & calculating magnification
A2.2.3 Developments in Microscopy
A2.2.4 Structures common to cells in all living organisms
A2.2.5 Prokaryote cell structures
A2.2.6 Eukaryote cell structures
A2.2.7 Processes of life in unicellular organisms
A2.2.8 Differences in eukaryotic cell structure between animals, fungi and plants
A2.2.9 Atypical cell structure in eukaryotes
A2.2.10 Cell types and cell structures viewed in light and electron micrographs
A2.2.11 Drawing and annotation based on electron micrographs
A2.2.12 AHL Origin of eukaryotic cells by endosymbiosis
A2.2.13 AHL Cell differentiation as the process for developing specialized tissues in multicellular organisms
A2.2.14 AHL Evolution of multicellularity