Which of the following is NOT a membrane-disrupting toxin?

A) A-B toxin

B) hemolysin

C) leukocidin

D) streptolysin O

E) streptolysin S

Answer is A-B toxin.

Explanation:

A membrane-disrupting toxin is toxin that affect the cell membrane. The effect of its secretion could be by interrupting the phospholipid layer or through pores formation on the membrane.

Membrane - disrupting toxins are regarded as exotoxins. Examples are leukocidin and hemolysin which their effects cause leakages of the cytoplasmic content and lysis of the cell, through the formation of pores on the cell membrane.

The A-B toxin are produced by the proteins of pathogenic organisms such as the bacteria. Example is botulinum toxin.