XI. Please provide complete correct solution. Preferentially done by hand or on

Question

XI. Please provide complete correct solution. Preferentially done by hand or on paper. Cells (APC) 42. Any cell can display antigen to a cytotoxic T-cell using whereas only Antigen Presenting will display antigen to a helper T-cell using _- a. Both MHC 1 &11; both MHC 1 &I1; b. MHCII; MHCL c. MHC I; MHC II. d. MHC I; MHCI e. MHC I; MHC 11. 43. The type of antibody first secreted by a plasma cell is typically a. IgM b. IgG c. IgD d. IgE e. All of the above 44. Virally infected cells often do not display antigen with MHC 1. Which type of cell targets viral-infected cells for destruction? a. b. c. d. Plasma cells. Cytotoxic T-cells. Macrophages & dendritic cells. Natural killer (NK) cells. 45. Different cells can respond differently to the same peptide hormone because a. different target cells have different sets of genes. b. a target cell's response is determined by components of its signal transduction pathways c. the circulatory system regulates responses to hormones by routing the hormones to specific targets. d. the hormone is chemically altered in different ways as it travels through the circulatory system 46. If a hormone activates a cAMP second messenger system in its target cell, the greatest response would result from introducing a molecule of the hormone to the extracellular fluid surrounding the cell. a. b. injecting a molecule of the hormone into the cytoplasm of the cell. applying a molecule of the second messenger to the extracellular fluid surrounding the cell. c. d. injecting a molecule of the activated, cAMP-dependent protein kinase into the cytoplasm of the cell. 47. Which of the following cells is haploid? a. Spermatogonium b. Primary spermatocyte. c. Secondary spermatocyte. d. All of the above. e. Only b. & c 48. A blood barrier exists in the brain and in the seminiferous tubules. What cells are responsible for this barrier? a. Astrocytes in the brain & Leydig cells in the testis. b. Ependymal cells in the brain & Sertoli cells in the seminiferous tubules. c. Microglial cells in the brain & Leydig cells in the testis d. Astrocytes in the brain & Sertoli cells in the seminiferous tubules. e. Schwann cells in the brain & Sertoli cells in the seminiferous tubules.

Explanation / Answer

42:

Any cell can display antigens to a cytotoxic T-cell using MHC I, whereas only APCs will display antigen to a helper T cell using MHC II. Thus, the correct option is (c).   

43:

The antibody first secreted by a plasma cell is IgM. Thus, the correct option is (a).

44:

Virally infected cells can be killed by NK cells. Thus, the correct option is (d).

45: Option (b)

46: Option (d)

47: option (c)

48: option (d)

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