All of the following are true about Shiga toxins EXCEPT:

All of the following are true about Shiga toxins EXCEPT:



A. Upon its activation, the B subunits bind to a host cell and facilitate transfer of the A subunit into the cell. The A subunit disrupt protein synthesis
B. It is a preformed toxin composed from one A subunit and five B subunits.
C. It is a holotoxin composed from one A subunit and five B subunits.
D. It is also produced by some pathogenic Escherichia coli


Answer: B. It is a preformed toxin composed from one A subunit and five B subunits.


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