Biology Paper 1 · B4 · Lesson 4.8
How the chemical reactions in living cells fit together.
Metabolism is the sum of all the chemical reactions in a cell or the body. It includes both building larger molecules and breaking molecules down. Respiration transfers energy for many of these enzyme-controlled reactions.
Metabolism is not just digestion or how quickly a person burns food.
No timer. Read the explanation after each answer.
Daily 5 · Core exam practice · Higher Tier questions · A4 revision sheet
Lessons 4.1–4.8 cover the core. Lessons 4.9–4.10 are Higher Tier only. Daily 5 practises core facts.
AQA Combined Science Trilogy specification · 4.4.2.3. Original notes, questions and diagrams. Experimental numbers are illustrative.
Photographs: pondweed by Frank Vincentz; dough by ElinorD, both CC BY-SA 3.0. Polytunnel by Bob Nichols / USDA, public domain. Images displayed without cropping or other alterations.
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