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Leçon 7 · classe 7–9
Cells and DNA: the code of life
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The cell is the brick of life: you carry ~30 trillion. Inside the nucleus sits DNA — instructions of 3 billion letters A-T-G-C. Genes build proteins from amino acids — like parts from a blueprint. Heredity is the parents\u2019 manuals mixed in half — so you resemble your family yet stay unique.
- ●Red blood cells live ~120 days — they renew constantly
- ●Neurons live longest — they stay for life
- ●Human and chimp DNA match ~98.8%
🔬 DNA tests solve forensics and ancestry: one hair is enough for the full portrait.
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Teste-toi !
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