**EXTRA CREDIT** Phosphorylation of signaling proteins can have activating or inhibitory effects on protein function. In many cases, the phosphorylation of an Inhibitory protein leads to inactivation of the inhibitor, resulting in downstream signaling. True Falsa D Question 62 ** EXTRA CREDIT** Secondary lymphoid organs, such as the lymph nodes, spleen, and mucosa-associated lymphoid tissues share some overall structural features, such as distinct T-cell and B-cell zones. One major difference between these organs is: The ability of raive T cells to be activated and proliferate in the organ The mechanism by which antigens or pathogens enter the organ Their function in bringing rare naive lymphocytes into contact with their specific antigen The presence versus the absence of macrophages and dendritic cells The ability of lymphocytes to enter the organ from the blood
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The statement says that the inhibitory protein leads to the inactivation of the initiator, resulting in downstream signaling. This statement is true. Inhibitory proteins can bind to and inhibit the activity of initiator proteins, preventing them from initiating Show more…
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1. _____ Circle True or False. T lymphocytes require the presence of antigen presenting cells to function. 2. _____ Circle True or False. The complement system always involves the classical pathway of complement activation. 3. _____ Circle True or False. An antigen is a substance which causes the body to produce sensitized T lymphocytes. 4. _____ Circle True or False. IgM accounts for 80 percent of all antibodies in the serum. 5. _____ Circle True or False. Antigen to antibody binding can result in opsonization.
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2. True or False: The phosphorylation cascade resulting from the activation of a receptor tyrosine kinase receptor allows for multiple cellular responses. a) False: Each phosphorylation cascade results in only one cellular response. b) False: The receptor tyrosine kinase activated phosphorylation cascade activates only the Ras pathway. c) True. The intracellular phosphorylation cascade that is activated by receptor tyrosine kinase receptors may activate multiple cells. d) True. When one receptor is activated, several intracellular proteins can be activated and contribute to different cellular responses. 6. Complete the following sentence. In general, the first step of the apoptosis mechanism is ___________ . a) The swelling of the cell b) Lysis of the cell c) Phagocytosis d) Cell condensation 7. Which of the following choices is NOT a role for apoptosis? a) Tissue resorption b) Cell differentiation c) Eliminate dead or diseased cells d) Organ development 8. What is the molecule that marks a cell for phagocytosis during apoptosis? a) Cell surface receptor b) Phosphatidylserine c) Cholesterol d) Phosphatidylinositol
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Is the statement true or false? Explain your reasoning and use an example. A B cell is only able to present antigen to a T cell that includes the epitope to which the B cell's receptor bound.
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