29. What reduces IgMs effectiveness? a. Can not activate complement b. Binds too

Question

29. What reduces IgMs effectiveness? a. Can not activate complement b. Binds too strongly to antigern c. Made late in immune response; infection already controlled d. Size (pentamer) prevents it from leaving blood stream easily 30. When does IgG reach its lowest concentration in a newborn? a. 3-4 days after birth b. 3-4 weeks after birth c. 3-12 months after birth d. there is no "low" point because the baby is making its own IgG long before the mother's IgG is consumed 31. Which of the following does not contain mucosal tissues? c. spinal cord a. gastrointestinal tract b. respiratory tract 32. Immune complexes are composed of antigen bound to immunoglobulin a. b. can bind to the surface of red blood cells c. are removed from red blood cells in the spleen and liver d. all of the above 33. Which is not true about IgA? made in connective tissue a. b. prevents pathogens from invading mucosal cells functions mainly as a monomer c. d. is removed with pathogen in secretions 34. Which cell releases cytokines that aid in B-cells becoming plasma cells? a. Macrophages b. Dendrites c. T Killer cells d. T Helper cells

Explanation / Answer

29. Ans: A. IgM cannot activate its complement because it was produced earlier and thus complements could not be found.

30. Ans: C. IgG is passed to the baby from the mother inutero itself until term and then after delivery the baby gets IgG from breast milk. After 6 months of age the transplacental IgG slowly disappears from the baby's circulation. The baby starts producing its own IgG from birth and gradually increases by 6 months of age. So from the age of 3 to 6 months IgG is low as a result of falling maternal IgG and infant's IgG is starting to be made.

31. Ans: C. Mucosal tissue is a layer of loose connective tissues that produces mucosa which is responsible for protection of the cavities and tracts. It is present only in the digestive, respiratory and reproductive systems.

32. Ans: D. Immune complexes are antigen-antibody binding, they bind with the red blood cells surface and are removed in spleen and liver.

33. Ans: C. IgA is produced in both monomer and dimer. But dimeric form is more prevalent and fuctional. It is also called as secretory IgA. Thus option C is not true about IgA.

34. Ans: C. T killer cells releases cytokines that aid in B cells becoming plasma cells.

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