2005 AP Biology Free Response

2005 AP Biology Free Response - Andre Mallqui Period 4 2005...

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Andre Mallqui Period 4 2005 AP Biology Free-Response Questions: 4. An important defense against diseases in vertebrate animals is the ability to eliminate, inactivate, or destroy foreign substances and organisms. Explain how the immune system achieves three of the following: Provides an immediate nonspecific response Activates T and B cells in response to an infection Responds to a later exposure to the same infectious agent Distinguishes self from nonself Vertebrate animals have the ability to eliminate, inactive and destroy foreign substances and organisms through the use of their bodily defenses. The immune system activates T and B cells in response to an infection, in various methods. Antigen presenting cell binds helper T cells to activate and/or stimulate helper T cells. They may also activate and/or stimulate cytotoxic T cells. Antigen binding to B cells activates B cells. Another method is through the use of Interleukin. The interleukin 1 from macrophages activates helper T cells. The interleukin 2 from helper T cells activate
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