Some Photosynthetic Bacteria Have Only One Type of Photosystem in Their

Multiple Choice

Some photosynthetic bacteria have only one type of photosystem in their plasma membrane. Which of the following is likely to be true regarding such bacteria?

A) They absorb purple light only.
B) Their photosystem is unrelated to those in cyanobacteria and plants.
C) They do not use water as the electron donor.
D) They lack ATP synthase.
E) All of the above.