 brain in intricacy. [C] is enclosed by numerous sensitive cells. [D] results in an effective communications network. 2. The principal task of the immune system is to _______________ [A] recognize and eliminate all foreign molecules that enter the body. [B] remove all the substances that invade the body organisms. [C] defend the body from the attacks of different viruses and bacteria. [D] identify and specify all nonself molecules it encounters. 3. The remembering power of a person’s immune system is _______________ [A] mostly descended from his/her ancestors. [B] partially passed down from his/her mother. [C] mainly acquired through fighting against foreign cells. [D] basically generated by its communications network. 4. Which of the following is NOT true according to the passage? [A] A tissue transplanted from father to daughter would be less acceptable than that transplanted between twins. [B] The immune system would never wrongly identify self as nonself and execute a misdirected immune attack. [C] When a normally functioning immune system attacks a nonself molecule, the system will remember the specifics of the foreign body. [D] The immune cells and other body cells can coexist peaceably in a state known as selftolerance. 5. The main idea of the passage may be generalized as_______________ [A] the su |
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