BIOA01H3 Lecture Notes - Lecture 22: Light-Dependent Reactions, Atp Synthase, Circadian Rhythm
13 May 2018
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BIOA01
LEC 22 Chapter 4&7: Photosynthesis
Oct 27, 2015
Quiz
- Why are leaves green?
- What is photosynthesis and where does it take place
→ Variation in Hibernation with Season
- Circadian rhythms
- Seasons
→ Variation in Light
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→ Variation in Water amount
example: fig tree uses water and light to produce sugar
*photosynthesis: light reaction + synthesis reaction
- an anabolic pathway
energy is used to build complex molecules from simpler components
→ Metabolism
How do figs make their own food?
→ Capturing Energy
- capture the light with various pigments
Example: green tea leaf
- absorb every colour but green
- - shows as green because it reflects green
Light energy + water + NADP + ADP + Phosphate → ATP + NADPH + oxygen
→ Absorption Spectra
- chlorophyll a absorbs
- chlorophyll b absorbs
→ cyclic electron transport
1) photon of light is being captured
2) electron transferred to plastoquinone
3) light energy is absorbed by photosystem 1
- an electron
4) proton motive force moves the H+ from stroma through ATP synthase …
→ do purple red leaves undergo less photosynthesis
- it is not supported from results
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