I got to tell u but it’s b
A i wrong because it says that they are similar.
B is wrong because archaea are phylogenetically similar to eukaryotes
C is also true because archaea are more phylogenetically similar to eukaryotes than bacteria
D is true because the Archaea did develop before Bacteria
so your answer is C because D says that archaea are different from bacteria because the archaea domain developed first, it does not say that they are dissimilar because of their appearance
I believe the answer is a
<h2>b) option is correct </h2>
Explanation:
- Some bacterial toxins cause disease by altering the activity of G protein, cholera toxin is one of them
- Cholera toxin catalyse ADP ribosylation of Gs and blocks GTPase activity thus Gs GTP become permanently active
- Constitutive activation of Gs protein continuously induce adenylyl cyclase, cytosolic cAMP level rises that leads to activation of protein kinase A (pKA)
- Activated pKA catalyse phosphorylation of two transmembrane proteins of intestinal epithelial cells:
- CFTR cause excessive outflow of Cl- ion and Na+ H+ exchange cause efflux of Na+ ion, both enters in gut and form Na+ Cl-
- Na+Cl- leads to outflow of water from the gut, resulting in diarrhea and dehydration and this condition may cause death of organisms due to loss of water and ions
