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Topic Notes · Easy summaries with diagrams
Chapter 7 — Chapter 7 — Enzymes
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📘Easy summary
Metabolism is the sum of all chemical reactions within an organism to sustain life. It has two subsets: catabolism and anabolism.
⭐Key points
- Catabolism: breakdown of complex molecules into simpler ones, releasing energy — cellular respiration, lipolysis.
- Anabolism: building complex molecules from simpler ones, consuming energy — photosynthesis, protein synthesis.
- Hummingbirds have one of the highest metabolic rates.
🔬Diagram
🌿Real-life example
Digesting and respiring glucose after breakfast is catabolism; building muscle protein is anabolism.
💡Exam tip
- Short Q2: anabolism demands input of energy — e.g. photosynthesis.
✅Quick check
1. Lipolysis is an example of:
2. Which consumes energy?
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