 
Order books online:
Press CTRL + D in
order to add this site to your Bookmarks. |
 |
Photosynthesis
Biology
Concepts
The
first photosynthetic organism appeared 3-3.5 billion years ago. Life on
earth continues to depend on photosynthesis both for its oxygen and for
its organic molecules. In photosynthesis, light energy is converted to
chemical energy, and carbon is fixed into organic compounds. The generalized
equation of this reaction is:
CO2
+ 2H2A + Light Energy ------------------------> (CH2O)
+ H2O + 2A
H2A
stands for water or some other chemical that gives off electrons. Photosynthesis
takes place within organelles known as chloroplasts. Photosynthesis has
two steps: (1) energy-capturing which takes place in Thylakoids and (2)
carbon-fixing which does not require light and takes place in Stroma. The
products of the first step are: ATP and NADPH. The products of the second
step are: organic compounds.
|
|
|
