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Chemistry That Powers Life
Living systems are controlled chemical networks that process energy, matter, and information.
Updated: 2026
Key ideas
Metabolism is organized chemistry
Cells run linked pathways that convert nutrients into usable energy and building blocks.
Enzymes are molecular catalysts
They speed specific reactions while reducing unwanted side effects.
Homeostasis is dynamic control
Feedback loops keep pH, temperature, and signaling in viable ranges.
Mental model
- Capture energy from food or light.
- Convert it into ATP and reducing power.
- Use controlled reactions for growth, repair, and signaling.
FAQ
Is biology separate from chemistry?
No, biology is chemistry under evolutionary constraints.
Why is water central?
Its polarity and heat capacity make it an ideal reaction medium.
What is the key takeaway?
Life works because reactions are compartmentalized, catalyzed, and regulated.