It involves injecting foreign substances directly into the bloodstream.
25. The passage implies that, in doing research on rat brains, Rosen discovered that
peptide hormones are used for intercellular communication
complementary DNAs do not bind to cells producing peptide hormones
products closely resembling peptide hormones are not identical to peptide hormones
some peptide hormones do not function as growth regulators
antiserums cross-react with substances that are not peptide hormones
26. Which of the following is a way in which the immunological method of detecting peptide hormones differs from the molecular method?
The immunological method uses substances that react with products of hormone-producing cells, whereas the molecular method uses substances that react with a specific component of the cells themselves.
The immunological method has produced results consistent with long-held beliefs about peptide hormones, whereas the molecular method has produced results that upset these beliefs.
The immunological method requires a great deal of expertise, whereas the molecular method has been used successfully by nonspecialists.
The immunological method can only be used to test for the presence of peptide hormones within the hypothalamus, whereas the molecular method can be used throughout the brain.
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