Porphyrin ring molecules are critical both for oxidative phosphorylation in the mitochondria and for photosynthesis in...

Porphyrin ring molecules are critical both for oxidative phosphorylation in the mitochondria and for photosynthesis in chloroplasts. Compare and contrast the role of this type of molecule in each process. Explain the roles of O2 and H2O in each process as well.

Expert Solution

The porphyrin ring molecules in the form of myoglobin (within muscle cells) transports oxygen from the surface of the cell to the mitochondria for the purpose fo oxidative phosphorylation. Moreover, the cytochrome molecules in the electron transport chain host heme groups (iron is captured within these), that are formed from the porphyrin molecues, which act as a depository of the extra electrons during oxidative phosphorylation.

The prphyrin molecules exist in the same form (heme) in the plants and similarly take part in the electron transport chain. However, in plants, another form of porphyrin molecule exists known as chlorophyll. It contains a base of porphyril molecule and several porphyrin side chains. In this form, Magnesium is capture within the molecule which help in absorbing the sunlight (red and blue light).

The oxygen accepts the electrons fron the electron transport chain (it splits the oxygen molecule) and accepts the proton to form water molecule.

During the process of photosynthesis, water molecule act as a source of electrons, which eventually form the NADP+/NADPH.

gladiator answered 1 year ago

Oxidative phosphorylation is a process that occurs in the _______________ of mitochondria.

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List three similarities and three differences between oxidative phosphorylation in the mitochondria and photophosphorylation in the...

List three similarities and three differences between oxidative phosphorylation in the mitochondria and photophosphorylation in the chloroplast

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