Photosynthesis/Aerobic Respiration

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There are many similarities and differences between the processes of aerobic respiration and photosynthesis. To start, aerobic respiration can be defined as a biochemical pathway through which chemical bond energy is released from food and changed into ATP. On the other hand, photosynthesis is manufacturing of carbohydrates out of CO2 and the splitting of water in the presence of light.

Photosynthesis and aer. respiration can be the same in many ways. For instance, both of them contain cycles. In photosynthesis, there is the Calvin cycle, and photosystem I, just producing ATP. In aer. respiration, there is the Kreb cycle. The equations for both of these processes are also similar, C6H12O6 + 602 --> 6CO2 + 6H2O + energy (aerobic respiration.) The only difference is that photosynthesis uses this equation in reverse. In aer. respiration, oxygen, NAD+ and FAD+ become reduced while ADP is phosphorylated and water along with 36-38 ATP as major molecules produced. The process of photosynthesis NADP+ and CO2 are reduced while RuBP is oxidized and 2 PGAL combine to make water as its major products. Also, both of these processes are used to keep cells alive and productive. In the thylakoid membrane (photosynthesis) and the interfolded part of the mitochondrial matrix, cristea,(aer. respiration) are cytochrome chains. Oxidative phosphorylation is used to pump electrons through proteins, which indirectly causes H+ ions to be pumped across a membrane and diffuses back through causing ADP to be phosphorylated making energy in the form of ATP. In both processes, ATP and NADH are present. Also, they are both concerned with oxygen but in photo. it is given off and in respiration it is a product.

Photosynthesis when contrasted with aer. respiration is also very different. Photosynthesis takes place in the chloroplast of plants in the thylakoids and aer. respiration occurs in the mitochondrion of cells. Both processes have different purposes starting off with saying that...
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