Chemistry for Biologists: Photosynthesis
The conversion of usable sunlight energy into chemical energy is ..
Substances react chemically in characteristic ways. In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different properties from those of the reactants. The total number of each type of atom is conserved, and thus the mass does not change. Some chemical reactions release energy, others store energy.
Examples of Chemical Reactions in Everyday Life - …
Any chemical process involves a change in chemical bonds and the related bond energies and thus in the total chemical binding energy. This change is matched by a difference between the total kinetic energy of the set of reactant molecules before the collision and that of the set of product molecules after the collision (conservation of energy). Some reactions release energy (e.g., burning fuel in the presence of oxygen), and others require energy input (e.g., synthesis of sugars from carbon dioxide and water).
This chemical energy is stored in ..
Chloroplasts:The Sites of Photosynthesis in Plants
All green parts of plants contain chloroplast (stem, unripened fruit)
Half a million chloroplast per square millimeter of leaf surface.
Chlorophyll is the green pigment located within chloraplast which causes the color of the leaf
The light energy absorbed by chlorophyll drives the synthesis of organic molecules in the chloroplast
Chloroplast are found mainly in mesophyll cells, the interior of the leaf
Stomata are pores which carbon dioxide enters and oxygen exists through the leaves
Water absorbed through roots are delivered to the veins which are also used to export sugar to the roots
Average mesophyll cells has 30 to 40 chloroplast
Stroma is the dense fluid within the chloroplast
Thylakoids are interconnected membranous sacs that segregate the stroma from another compartment
Chlorophyll resides in the thylakoid membranes
The Two Stages of Photosynthesis: A Preview
Light Reactions and the Calvin Cycle are the two stages of photosynthesis
The light reactions are the steps that convert solar energy to chemical energy
The hydrogen ions and electrons are accepted by NADP+ where they are temporarily stored.