1
Read the following statements regarding gene regulation
(A) . Two component systems regulate large number of genes in archaea and bacterial parasites of higher organisms
(B) . Mtr regulatory system regulates nitrogen assimilation in many bacteria
(C) . Nar regulatory system controls the genes that allow the use of nitrate or nitrite (or both) as alternative electron acceptors
during anaerobic respiration
(D) . Most eukaryotic signal transduction pathways rely on phosphorylation of histidine residues of proteins
(E) . The osmolarity of the environment controls the relative levels of the proteins OmpC and OmpF in the E. coli outer
membrane
Choose the correct answer from the options given below: