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Both take place at some point within an organelle (mit. = CR, chloroplast= photo.)
Cell Respiration & Photosynthesis (similarties)
Both utilize ATP for energy at some points.
Both provide power for cellular activities.
Both involve electron transport chains.
Cell respiration and Photosynthesis ( Differences)
Photosythesis utilizes 2 electron transport chains (not just 1).
In Photo. , energy is provided by photons and not catabolic processes as in cell. resp.
Cellular respiration depends on oxygen as a substrate.
Photosynthesis involves the production of NADPH (CR involves NADH and FADH2)
Photosynthesis involves CO2 and H20 as substrates (splitting h20 provides the electrons for the process).
The Connection of Photosynthesis and Cellular Respiration
Cellular respiration is kind of like the 'flipped' version of this process, wherein compounds are degraded to release energy through an 'electron transport' mechanism. It also occurs in a specialized organelle, the mitochondria.
Photosynthesis uses an 'electron transport' mechanism and sunlight to 'build' glucose. It occurs in a specialized organelle known as a chloroplast.
