Question

immunology

practing samples and not sure if my answers correct.

1. NK cells are effective against viral infections because many virus infected cells a. are susceptible to lysis b. are susceptible to phagocytosis c. show reduced levels of MHC class I molecules d. show reduced levels of MHC class II molecules e. none of the above 2. Arachidonic acid serves as a substrate in the lipoxygenase and cyclooxygenase pathways resulting in the production of a. histamine, leukotrienes b. leukotrienes, prostaglandins c. prostaglandins, fibrin d. bradykinin, fibrin e. none of the above 3. The composition of this complex is the same for all complement pathways a. C3 convertase b. C4 convertase c. CS convertase d. membrane attack complex c. none of the above 4. During the process of neutrophil extravasation, the adhesion molecules that are activated in response to chemokine stimulus and are responsible for arrest and adhesion are the a. mucins b. selectins c. integrins d. ICAMS e. none of the above 5. C3b is responsible for a variety of complement related functions including a. initiation of the alternative pathway b. opsonization and enhanced phagocytosis c. clearance of immune complexes from the circulation d. a and b e. a and c f. bande g. none of the above

Answer 1

Question 1. -

Answer- C. Show reduced level of MHC class I molecule

Reason- Natural killer cells destroy which are infected with pathogens. Natural killer cell destroys the cell by releasing certain molecules.NK detect low MHC I and unusual marker on cancer cells.

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