Some photosynthetic bacteria (e.g., purple sulfur bacteria) have only photosystem I, whereas others (e.g., cyanobacteria) have both photosystem I and photosystem II. Which of the following might this observation imply?
A) Photosystem II was selected against in some species.
B) Photosynthesis with only photosystem I is more ancestral.
C) Photosystem II may have evolved to be more photoprotective.
D) Linear electron flow is more primitive than cyclic flow of electrons.
E) Cyclic flow is more necessary than linear electron flow.
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Bacteria Diagram
bacteria
The process of phagocytosis: a phagocyte engulfing bacteria or other foreign material.
Probiotics are live microorganisms, usually bacteria, mainly found in cultured dairy foods
Salmonella Bacteria