Which one of the following statements about exotoxins is not correct ?
A. When treated chemically，some exotoxins lose their toxicity to become toxoid.
B. Some exotoxins are capable of causing disease in purified form，free of any bacteria
C. Some exotoxins act in the gastrointestinal tract to cause diarrhea
D. Some exotoxins contain lipopolysaccharides as the toxic component
查看答案
Which one of the following statements concerning exotoxins is not correct ?
A. Exotoxins are polypeptides
B. Exotoxins are more easily inactivated by heat than are endotoxins;
C. Exotoxins are less toxic than the same amount of endotoxins;
D. Exotoxins can be converted to toxoids;
Which term describes the objective manifestations of disease thatcan be observed or measured by doctors?
A. Signs
B. symptoms
C. syndromes
D. infection
Which term describes subjective characteristics of a disease that can be felt by the patient alone?
A. Signs
B. symptoms
C. syndromes
D. infection
Which mechanism about how LPS induces fever is not right?
A. LPS stimulate monocytes in blood to release IL6,IL1 and TNFa;
B. IL6,IL1 and TNFa are called endougenous pyrogens to stimulate hypothalamus and induce fever ;
C. IL6,IL1 and TNFa are elevated and circulaedin blood to reach brain;
D. LPS enter blood to reach hypothalamus directly to induce fever.
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