Although there are some differences between oxygenic photosynthesis in plants, algae, and cyanobacteria, the overall process is quite similar in these organisms.There are also many varieties of anoxygenic photosynthesis, used mostly by certain types of bacteria, which consume carbon dioxide but do not release oxygen.The bacteriorhodopsin changes its configuration in response to sunlight, acting as a proton pump. These pigments are embedded in plants and algae in complexes called antenna proteins.Tags: Geography Dissertation Research QuestionsProduct Business PlanBag Book ReportBusinessballs Business PlanAssignment AbroadCheap Essay 3 DaysWriting A Thesis Paper For Dummies
In plants, algae and cyanobacteria, long-term energy storage in the form of sugars is produced by a subsequent sequence of reactions called the Calvin cycle; some bacteria use different mechanisms, such as the reverse Krebs cycle, to achieve the same end.
In the Calvin cycle, atmospheric carbon dioxide is incorporated into already existing organic carbon compounds, such as ribulose bisphosphate (Ru BP).
During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide. Plants absorb light primarily using the pigment chlorophyll.
Most organisms that utilize oxygenic photosynthesis use visible light for the light-dependent reactions, although at least three use shortwave infrared or, more specifically, far-red radiation. The green part of the light spectrum is not absorbed but is reflected which is the reason that most plants have a green color.
In these light-dependent reactions, some energy is used to strip electrons from suitable substances, such as water, producing oxygen gas.