Brainlag PlusThe reactions that build and break down molecules in cells, the liver's job with lactic acid, and measuring respiration rate with a respirometer.
All the reactions in a cell
Metabolism is the sum of all the reactions in a cell or the body.
Enzymes control them, and the energy comes from respiration.
- glucose → starch (plants), glycogen (animals) or cellulose (plant cell walls)
- one glycerol + three fatty acids → a lipid
- glucose + nitrate ions → amino acids, then amino acids → proteins
- respiration breaks glucose down
- excess amino acids are broken down, and urea is made to be excreted
Higher: lactic acid from muscles is carried in the blood to the liver and converted back into glucose.
The rest of this lesson and its 10 practice questions are in Plus.
Screen 1 of 3, free to read.
- 10 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards