Which statement about comparison between exotoxins and endotoxins is not correct ?
A. They are less toxicthan exotoxins
B. They are more stable on heating than exotoxins
C. They bind to specific cell receptors，whereas exotoxins do not
D. They are part of the bacterial cell wall，whereas exotoxins are not.
查看答案
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
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
微信支付 
支付宝支付