Microbes · Chapter 1: Origins of life and cells
Year 11 SCX · About 15 minutes with activities · Turn your sound on
Chapter 1 recap
- Prebiotic Earth: reducing atmosphere (NH₃, H₂, very little O₂), much warmer, intense UV (no ozone layer), volcanic gases (H₂O, CO₂), constant asteroid bombardment.
- Oparin–Haldane: simple organic molecules → polymers → a self-replicating polymer → a cell. Miller–Urey: gases + sparks made amino acids, evidence for step 1.
- Cells: a cell is the smallest unit of life; all cells come from pre-existing cells. Life processes: MRS GREN. Prokaryotes lack a nucleus; eukaryotes have one.
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