Question 6 is based on the following passage. The selective Proliferation and di

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Question 6 is based on the following passage. The selective Proliferation and differentiation of lymphocytes that occurs the first time the body is exposed to an antigen is the primary immune response. In the primary response, about 10 to 17 days are required from initial exposure to antigen for selected lymphocytes to generate the maximum effector cell response. During this period, selected B cells and T cells generate antibody-producing effector B cell, called plasma cells, and effector T cells, respectively. Eventually, symptoms of illness diminish and disappear as antibodies and effector T cells clear the antigen from the body. If that individual is exposed to the same antigen at some later time, the response is faster (only 2 to 7 days), of greater magnitude, and more prolonged. This is secondary immune responses. The immune system's capacity to generate immune response is called immunological memory. The primary immune response ends when antigen is gone from the body as soon as the first effector cell is generated after exactly 2 weeks when lymphocytes proliferate Question 7 is based on the following passage Lymphocyte Development Gives Rise to an Immune System that Distinguishes Self From Nonself. B cells and T cells mature in the bone marrow and thymus. Lymphocytes bearing receptors specific for molecules already present in the body are either rendered nonfunctional or destroyed by apoptosis (programmed cell death). Thus the body normally has no mature lymphocytes that react against self components: The immune system exhibits the critical feature of self-tolerance. Failure of self-tolerance can lead to autoimmune disease such as multiple sclerosis. In the passage, self means, and nonself means. what you wore born with, what you were not born with What is due to genes; what is due to environment being unique; being a clone your own body, anything that not part of your own body

Explanation / Answer

6. The most appropriate choice is option a.

An immune response, primary or secondary, will end when the antigen has been cleared from the body.

7. The most appropriate choice is option d.

Self refers to one's own body, and non-self to anything that is not part of one's own body.

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