Final answer:
The anthrax toxin interrupts normal cell signaling at the point of second messenger action in the cell signaling pathway.B. Second messenger action
Step-by-step explanation:
The anthrax toxin interferes with adenylate cyclase, which is involved in the production of the second messenger molecule cyclic adenosine monophosphate (cAMP).
Therefore, the toxin would interrupt normal cell signaling at the point of second messenger action in the cell signaling pathway.
Cyclic AMP (cAMP) plays a crucial role in signal transduction by activating downstream components, including protein kinase A (PKA), which regulates various metabolic pathways in the cell.