Microbiology General ca582ad0 Exotoxins are - A Lipopolysaccharide in nature B Produced by gram -ve bacilli C Highly antigenic D Very stable and resistant to chemical agents High-Yield Explanation Exotoxins are protein in nature Produced by both gram (+) ve and gram (-) ve bacteria They are highly antigenic They are sensitive to chemical agents like formaldehyde and can be toxoided.