The Two Photosystems of Light-Dependent Reactions are Designated ____

Question

The two photosystems of light-dependent reactions are designated ____.  
A) type 1 and type 2
B) type I and type II
C) photosystem A and photosystem B
D) photosystem 680 and photosystem 700
E) photosystem I and photosystem II

Accepted Answer

The commonly used designations for the two photosystems in light-dependent reactions are photosystem I and photosystem II, which refer to their order of discovery and the wavelength of light they absorb.