Answer:
It is A
Explanation:
I had this question on my test last week.
<span>Cell responses b and c would both occur when cell exposed to the a+b signaling molecules.
The presence of the C signaling molecule will lead to cell response c. Cell response b occurs because the activation of c2 in the C pathway stimulates b1, leading to cell response b. Cell response A remains inactivated because it is inhibited by pathway b activation and its signaling molecule was not present.</span>
Bacteria
Nitrogen fixing bacteria are those that convert atmospheric nitrogen to different nitrogenous ions and add them to the soil. These bacteria may either be free living in the soil, or they may develop a mutualistic relationship with some organisms, such as the nitrogen fixing bacteria that live in the root nodules of leguminous plants. An example of a genus of nitrogen fixing bacteria is the genus Azotobacter.
<span>The Woese-FOX system of classification had three kingdoms in contrast to the Whittaker system's five kingdoms. However, both used information from genetic analysis about the cell biology of prokaryotic organisms to recognize divisions between types of prokaryotes and create separate kingdoms for the distinct types.</span>
