Quiz 25 - Macrophages play a key role in initiating a...

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Question 1 Multiple Choice 0.5 points What is the major difference in the types of antigens bound by B cell receptors and those bound by T cell receptors? B cell receptors bind intact extracellular antigens on the surface of microbes or free in body fluids. T cell receptors bind small fragments of intracellular antigens that are complexed with MHC molecules. B cell receptors remain bound to the cell membrane but T cell receptors can be released to form circulating antibodies. Only B cells can present antigens to B cell receptors and only T cells can present antigens to T cell receptors. B cell receptors bind only to viral antigens and T cell receptors bind only to bacterial antigens. Question 2 Multiple Choice 0.5 points Which one of the following statements about antigen-presenting cells is false?
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Unformatted text preview: Macrophages play a key role in initiating a secondary immune response by presenting antigens to memory helper T cells. Class I MHC molecules displaying bound peptide antigens are recognized by helper T cells. Dendritic cells express both class I and class II MHC proteins on their surfaces. More cells express class I MHC proteins than class II MHC proteins. Question 3 Multiple Choice 0.5 points Which one of the following processes of osmoregulation by the kidney is the least selective? salt pumping to control osmolarity proton pumping to control pH reabsorption filtration secretion Question 4 Multiple Choice 0.5 points Which one of the following is most involved in water conservation in mammals? Bowman’s capsule juxtamedullary nephrons podocytes urethra ureter A,b,d,b....
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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