Chapter 21 Study Guide

What distinguishes the innate defense system from the adaptive defense system?

Adaptive is the lymphocytes Innate is the skin and internal defenses

A macrophage has just phagocytosed a clump of bacteria. Fragments of bacterial proteins will be displayed on the surface of the macrophage in combination with a [___] protein and will be recognized by a [___]. A) class I MHC- Cytotoxic T cells B) Class I MHC- helper T cells C) Class II MHC- helper T cells D) Class II MHC- cytotoxic T cells

C) Class II MHC- helper T cells

A person is bitten by a rattlesnake and receives an injection of antivenom, a serum containing antibodies that neutralize the venom. This is an example of: A) naturally acquired active immunity B) artificially acquired active immunity C) naturally acquired passive immunity D) artificially acquired passive immunity

D) artificially acquired passive immunity