The Selective/clonal Selection Theory of Immune Response Ultimately Proved to Be

question 19

Multiple Choice

The selective/clonal selection theory of immune response ultimately proved to be correct, but the instructional theory, while incorrect, seemed logical because

• A)if thousands of preformed antibodies were present to antigens that are never encountered, this is excessively wasteful and poor use of the body's resources.
• B)the immune system was shown to be capable of such a wide variety of substances that it seemed impossible that such a high number of different possibilities would be preformed without any prior exposure.
• C)if one gene produces one antibody, then it didn't seem that humans had enough DNA to produce thousands of possible antibodies.
• D)it seemed reasonable that a cell would be "instructed" to react to a specific antigen only when it was encountered.
• E)All of the above.

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