2. The text suggests that a substance detected in the brain by use of antiserums to peptide hormones may
[A] have been stored in the brain for a long period of time.
[B] play no role in the functioning of the brain.
[C] have been produced in some part of the body other than the brain.
[D] have escaped detection by molecular methods.
3. According to the text, confirmation of the belief that peptide hormones are created in the brain in areas other than the hypothalamus would force scientists to
[A] reject the theory that peptide hormones are made by endocrine glands.
[B] revise their beliefs about the ability of antiserums to detect peptide hormones.
[C] invent techniques that would allow them to locate accurately brain cells that produce peptide hormones.
[D] develop a theory that account for the role played by peptide hormones in the brain.
4. Which of the following is mentioned in the text as a drawback of the immunological method of detecting peptide hormones?
[A] It cannot be used to detect the presence of growth regulators in the brain.
[B] It cannot distinguish between the peptide hormones and substances that are very similar to them.
[C] It uses antiserums that are unable to cross the blood-brain barrier.
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