BIOSC-101 Lecture Notes - Lecture 23: Light-Dependent Reactions, Light-Independent Reactions, Intermembrane Space
22 Oct 2020
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Document Summary
Photosynthetic organisms are photoautotrophs and are the main producers on earth. They convert light energy into chemical energy and use it to assemble and make organic molecule that they sometimes use for their own energy. They are a source of food to others, directly or indirectly. In the end our bodies will be decomposed by bacteria and other decomposers. Both light dependent and light independent reactions take place in the chloroplasts. Chloroplasts has three membranes; the outer membrane, inner membrane, and thylakoid membrane. Between the inner and outer membrane there is the intermembrane space and inside the inner membrane there is stroma. The light dependent reaction occurs in the thylakoid while the calvin cycle occurs in the stroma. Absorption of a photon by a pigment molecule excites the electron from ground state to an excited state. The difference between the ground state and excited state must match the energy of the photon or the photon is not absorbed.
