Question

Which of the following organisms could not produce an exotoxin?

Select one:

a. Escherichia coli

b. Staphylococcus aureus

c. Clostridium botulinum

d. Ebola virus

e. all of the above could produce an exotoxin

Answer 1

ANSWER IS :

d. Ebola virus

EXPLANATION:

Microbial toxins are produced by micro-organisms such as bacteria and fungi that induce infection and disease by damaging host tissues or by infecting immune system.

Microorganisms such as bacteria and viruses can cause disease, but bacteria release toxins and viruses damage our cells and not produce toxins...And this is answer to your question.

Although viruses dependent on the host cell for their reproduction and DNA sequences in viruses can produce similar toxins that is incorporated in a viral genome and therefore can be expressed in the infected host to induce toxicity.

Hope it is clear to you... Now let's go to other options also to make it more clear

Exotoxins trigger specific host cell necrosis, for example leukocidin produced by Staphylococcus aureus which is toxic to granulocytes.

Exotoxin produced by E. coli O157:H7 causes severe hemorrhaging as it blocks protein synthesis within vascular endothelial cells, and so kill them.

Exotoxins such as botulinum toxin which is produced by Clostridium botulinum....