A primary difference between cyanobacteria and purple and green photosynthesizing bacteria is
A)energy source.
B)cell wall type.
C)electron donor for CO₂ reduction.
D)cell type.
E)color.

Question

Quizplus · Accepted Answer

The primary difference between these bacteria is the electron donor for CO₂ reduction during photosynthesis. Cyanobacteria use water as their electron donor, while purple and green photosynthesizing bacteria use various organic molecules or hydrogen sulfide instead of water. Other differences such as energy source and cell wall type are not unique to one group and can vary among all types of bacteria. Color is a visible difference but not the primary one.

A Primary Difference Between Cyanobacteria and Purple and Green Photosynthesizing