Uses of ATP at Higher Level: The same statement as SL. HL questions ask for a range of uses with examples, such as myosin heads, cilia, endocytosis and the phosphorylation of glucose in glycolysis.
Practise this as you read
- State processes powered by ATP.
- Outline the range of uses of ATP, with examples.
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The big idea: ATP supplies energy to three groups of life processes: active transport, anabolism (building macromolecules) and movement.
The points to remember
- Active transport: pump proteins move ions or molecules against their concentration gradient.
- Anabolism: joining monomers into macromolecules, such as proteins, DNA and glycogen.
- Movement: muscle contraction, flagella and cilia, and chromosomes moving in cell division.
- Each use hydrolyses ATP to ADP and phosphate, releasing the energy.
Remember it as: Pump, build, move: the three jobs of ATP.
Real example: myosin heads. In a muscle fibre, each myosin head uses one ATP to detach from actin and re-cock, ready for the next pull. Without ATP the heads stay locked, which is why muscles stiffen after death.
Trap: Diffusion and osmosis do not use ATP: substances move down their gradient on their own.
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How it is asked: Expect a State question asking for two processes powered by ATP, or a longer Outline of its uses, each with an example.
IB-style questionOutline[3 marks]
Outline three different life processes in cells that use energy from ATP, with an example of each.
Model answer plan
See the answer broken into clear points, with guidance on how each point earns marks.