Microbiology 9th Edition by Laura Black, Jacquelyn Black

Exercise 2

Which of the following is not true about the complement system?
(a) It is a set of more thaN₂0 proteins that play a key role in host defense by specifically acting in different ways toward different microorganisms.
(b) Its general functions include enhancing phagocytosis by phagocytes, lysing microbes and enveloped viruses di rectly, and generating peptide fragments that regulate inflammation and immune responses.
(c) It is a fast-acting innate host defense that works in a cascade.
(d) There are three pathways classical, lectin, and alternative.
(e) The effects of each activation pathways are the same.