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.
Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
A Punnett square depicting a cross between two pea plants heterozygous for purple (B) and white (b)
A plaque is a clear area in which all bacteria have been lysed by phages
Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d
Spirilla bacteria.
A compound of iron and sulfur crystallizes in a lattice pattern described as cubic closest ...