Question

37. What is NOT correct about phagocytic, professional antigen-presenting cells? a. they produce a respiratory burst as soon as the phagosome is formed around the foreign particle b. They create toxic reactive oxygen species to immediately kill microorganisms c. They bind a foreign peptide antigen in the cleft between two chains of the MHC Class II d. e. molecule Have receptors for immunoglobulins and C3b all are correct

Answer 1

Answer: Option e. All are correct

Explanation: a. They produce a respiratory burst as soon as the phagosome is formed around the foreign particle is true because when these cells are stimulated, they consume oxygen and produce superoxide (O2-) called as respiratory burst within the phagosomes. Hence, option a is correct

b. They create toxic reactive oxygen species to immediately kill microorganisms is also correct because reactive oxygen species are employed as immediate weapons generated by the NADPH oxidase and can kill pathogens by oxidative damage or indirectly stimulate elimination of pathogens by nonoxidative mechanisms

c. They bind a foreign peptide antigen in the cleft between two chains of the MHC Class II molecule is also correct

d. Have receptors for immunoglobulins and C3b is correct as these cells recognise pathogens opsonized by Immunoglobulin IgG and have receptors for C3b.

Hence, all options are correct