Question

Compare and contrast photosystem I and photosystem II

Why is oxygen important to aerobic metabolism? Explain the specific role.

Answer 1

Answer =

Comparison between photosystem I & II:

1.Both photosystems consists of a complex of molecules embedded in thylakoid membranes of the chloroplast.

2.Both are replenished by the electrons.

3.Both contains chlorophyll molecules which can convert light energy into chemical energy.

4.In both photosystems , a photon causes an electron to reach a high energy level.

contrast photosystem I and photosystem II :

photosystem I	photosystem II
1.Is sensitive to light wavelengths of 700 nm.	1.Is sensitive to light wavelengths of 680 nm.
2.PSI gets electrons from the PSII through an electron transport chain.	2.PSII gets electrons from spliting of water.
3.is located on the outer surface of thylakoid membrane.	3.3.is located on the outer surface of thylakoid membrane.
4.It synthesizes NADPH	5.It synthesizes ATP.
5.It consists of reaction center P700, chlorophyll and other pigments.	5.It consists of reaction center P680, chlorophyll and other accessory pigments.

oxygen important to aerobic metabolism because :

Aerobic metabolic fuels most of the energy.during aerobic metabolism the nutrients like carbohydrates , fats and proteins are converted into carbon dioxide in presence of oxygen.

major role of oxygen in aerobic metabolism is synthesis of ATP.

ATP is the major source of energy.