WebQuest
Biology - photosynthesis
Introduction
Photosynthesis is a process used by plantsand other organisms to convert light energyinto chemical energy that can later be released to fuel the organisms'activities.This chemical energy is stored in carbohydratemolecules, such as sugars,which are synthesized from carbon dioxide and water.
Where photosynthesis takes place - Photosynthesis happens in the plants green part - cell chloroplast. Chloroplast is contained within two membranes. It is made out of liquid stroma and with a mambrane contained grana stacks.
- Light-dependent reaction
- Light-independent reaction
In the light-dependent reactions, one molecule ofthe pigment chlorophyll absorbsone photon andloses one electron.This electron is passed to a modified form of chlorophyll called pheophytin,which passes the electron to a quinone molecule,starting the flow of electrons down an electron transport chain that leadsto the ultimate reduction of NADP to NADPH. In addition, thiscreates a proton gradient across the chloroplast membrane, which is used by ATP synthase inthe synthesis of ATP. The chlorophyll molecule ultimatelyregains the electron it lost when a water molecule is split in a processcalled photolysis, which releases a dioxygen (O2)molecule as a waste product.
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