Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm.
B. The system involves a sensor kinase and a response regulator.
C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes.
D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.
Answer: C
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