Question

What are the functions of (A) photosystem I and (B) photosystem II? please provide a detailed explanation of each and any important similarities or differences. This is a biochem question so think along those lines when answering. Thank you!

Answer 1

Photosystems are involved in photo synthesis.They are located in thylakoid membrane.They are two types:

1.Photosystem 1

2.Photosystem 2.

These are structural and functional units of protein complexes.The main goal of these photosystems is to produce energy.

Photosystem 1 produces the high energy carriers ATP and NADPH by using light energy.

The photosystem 2 act as a water-plastoquinone oxido-reductase.It is the main function of photosystem 1.

Differences between photo system 1 and 2:

Photosystem 1 absorbs longer wavelength of light which is 700nm.

Photosysytem 2 absorbs shortest wavelength of light which is 680nm.

In photosystem 1 no photolysis occur.

In photosystem 2 photolysis occur.

Photosystem 1 contains chlorophyll and carotenoids.

Photosystem 2 contains chlorophyll,xanthophylls and phycobilins.

Similarities between photosystem 1 and 2:

Both are the protein mediated complexes.