Question

10. Innate immune cells express recognize ______.
A. generalized pathogen features through pattern recognition receptors
B. opsonized pathogens
C. specific pathogen peptide chains presented by MHC class I receptors
D. Both A and B

12. True or False: Microbes taken up by phagocytosis are cleared using reactive oxygen species (ROS) or lytic enzymes, never both.

Answer 1

10. Pattern recognition receptors and opsonised pathogen receptors are key elements of innate immune system and are specialized in their recognition.

MHC class I receptors are charcterischara of adaptive immunity.

Hence option (D) is correct.

12. During phagocytosis the microbes are englufed into intracellular vesicle called phagosome, which then combines with lysosome forming phagolysosome. The microbes are then killed by respiratory burst using reactive oxygen species and is called oxygen dependent killing. They may also be killed by the production of enzymes and is called oxygen- independent killing.

Hence the statement is ( True).