Biology

Difference between photosystem I and photosystem II

Main difference

A photosystem is a process in plants and other organisms to absorb sunlight and use it as an energy source; This system allows plants to convert light energy into chemical energy. There are two photosystems in the thylakoid membrane of chloroplasts in plant leaves. These are Photosystem I and Photosystem II. Photosystem I is the system that absorbs photons of light of the wavelength of 700 nm, while Photosystem II absorbs photons of the wavelength of 680 nm. Photosystem I is so named because it was discovered first and Photosystem II was discovered later. But if we look at its function, Photosystem II comes before Photosystem I. The only major difference between Photosystem I and Photosystem II is the length wave of light it absorbs. But nevertheless,

Comparative chart

Photosystem I Photosystem II
Light Photosystem I absorbs light with a wavelength of 700 nm. Photosystem II absorbs light of wavelengths of 680 nm.
Active center Photosystem I has the active center P700. Photosystem II has the active center P680.
Photophosphorylation Photosystem I participates in cyclic and non-cyclic photophosphorylation. Photosystem II participates only in non-cyclic photophosphorylation.
Principal function The main function of photosystem I is ATP synthesis. The main function of photosystem II is the synthesis of ATP and the photolysis of water.
Situated in Photosystem I is found on the outer surface of the thylakoid grana. Photosystem II is found on the inner surface of the thylakoid scar.
Binding proteins Photosystem I has larger binding proteins. Photosystem II has smaller binding proteins.
What is Photosystem I?

Photosystem I is one of the photosystem systems involved in photosynthesis. Photosystem I is so named because it was discovered first and photosystem II was discovered later.

Photosystem I is found on the outer surface of the thylakoid grana. Photosystem I is a complex of protein collections. It is sensitive to light and absorbs light of approximately 700 nm. Its pigments absorb light and use it as a source of energy. And it is not associated with the photolysis of water. Here the light energy is converted into chemical energy and is finally used in the photosynthesis process. The main function of photosystem I is to synthesize ATP. Photosystem I participates in cyclic and non-cyclic photophosphorylation. Photosystem I includes the following pigments:

  1. Chlorophyll -a 670
  2. Chlorophyll -a 680
  3. Chlorophyll -a 695.
  4. Chlorophyll -a 700.
  5. Chlorophyll b

What is Photosystem II?

Photosystem II is one of the photosystem systems involved in photosynthesis. Photosystem II was discovered later. But if we look at its function, photosystem II comes before photosystem I. Photosystem II is located on the inner surface of the thylakoid cluster. Photosystem II has a smaller binding protein compared to Photosystem I which has a MW of 110,000. It absorbs light of approximately 680 nm. Its pigments absorb light and use it as a source of energy. And it is associated with the photolysis of water. Here the light energy is converted into chemical energy and finally used in the photosynthesis process. The main function of photosystem II is the synthesis of ATP and the photolysis of water. Photosystem II participates only in non-cyclic photophosphorylation.

Photosystem II includes the following pigments:

  1. Chlorophyll -a 660
  2. Chlorophyll -a 670
  3. Chlorophyll -a 680.
  4. Chlorophyll -a 695.
  5. Chlorophyll -a 700.
  6. Chlorophyll
Photosystem I vs. photosystem II
  • Photosystem I absorbs light of wavelengths of 700 nm, while photosystem II absorbs light of wavelengths of 680 nm.
  • Photosystem I has the active center P700 while photosystem II has the active center
  • Photosystem I participates in cyclic and non-cyclic photophosphorylation, while photosystem II only participates in non-cyclic photophosphorylation.
  • The main function of photosystem I is to synthesize ATP, on the other hand, the main function of photosystem II is to synthesize ATP and photolysis of water.
  • Photosystem I is located on the outer surface of the thylakoid scar, while photosystem II is located on the inner surface of the thylakoid scar.
  • Photosystem I has larger binding proteins, while photosystem II has smaller binding proteins.

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