Practice question · Match the pairs
Match each molecule to its role in photosynthesis.
- Chlorophyll
- Water
- NADPH
- Rubisco
- Fixes carbon dioxide onto a five-carbon acceptor
- Absorbs the light energy
- Is split, supplying electrons and releasing oxygen
- Carries reducing power to the Calvin cycle
Hints
- Each molecule does one job in the two-stage process.
- One of these is thought to be the most abundant protein on Earth.
Show the answer
- Chlorophyll → Absorbs the light energy
- Water → Is split, supplying electrons and releasing oxygen
- NADPH → Carries reducing power to the Calvin cycle
- Rubisco → Fixes carbon dioxide onto a five-carbon acceptor
Why
Chlorophyll captures the photon, water supplies electrons and yields oxygen, NADPH carries reducing power across to the stroma, and rubisco performs the actual fixation, a slow enzyme that plants compensate for by making enormous quantities of it.
Practise Photosynthesis and the Oxygen Revolution
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