Aoa! *Bt302.* *7th June, 5:30pm.* *MCQs:* 1. No need of *antibody* in alternate complement system. 2. Natural Killer (NK) cells *lymphoid Lineage.* 3. *Nucleic Acids,* poor Immunogens. 4. Staphloccocal Exfoliatin toxin causes *Scalded Skin Syndrome.* 5. Hyper variable and framework regions are part of *variable region.* 6. Responsible for ?Mucosal immunity" *IgA.* 7. Major class of antibody is *IgM* in primary Ab response. 8. Lag phase *shorter as compare to primary exposure.* 9. *Class Switching* the process by which a B Cell changes the class of Ab but not specificity. 10. Selection Hybridoma cell: *Using HAT.* 11. *IgG* major antibody of serum-75% of total antibodies. 12. T-cells maturation in *thymus.* 13. Suppose 10,000 lymphocytes recirculate every hour. If 100 of these encounter an antigen in lymph node then what percentage it achieved *1%.* 14. BASOPHIL secretes *histamine.* *Short qs:* 1. Affinity maturation? 2. Define immunogen, antigen and hapten. 3. Effector functions of complement proteins? *Long qs:* 1. Antigen classification on which basis? Explain type and subtypes? 2. MHC? Differentiate between MCH 1 & MCH 2? 3. Different pathways of complement system? *~Rafia Batool.*