Ch. 23 Lehninger Biochem| Questions and Answers(A+ Solution guide)

1. The radioimmunossay (RIA) is based on competition of unlabeled and radiolabeled: A) antibodies for binding to a hormone. B) antibodies for binding to a receptor. C) hormone for binding to a receptor. D) hormone for binding to an antibody. E) receptor for binding to a hormone. - D 2. One distinction between peptide and steroid hormones is that peptide hormones: A) act through nonspecific receptors, whereas steroid hormones act through specific receptors. B) are generally water-insoluble, whereas steroid hormones are water soluble. C) are more stable than steroid hormones. D) bind to cell surface receptors, whereas steroid hormones bind to nuclear receptors. E) bind to their receptors with high affinity, whereas steroid hormones bind with low affinity - D 3. Insulin is an example of a(n) ____________ hormone. A) catecholamine B) eicosanoid C) paracrine D) peptide E) steroid - D 4. The maturation of insulin from its precursor (preproinsulin) involves:A) acetylation. B) oxidation. C) phosphorylation. D) proteolysis. E) reduction. - D 5. Epinephrine is an example of a(n) ____________ hormone. A) catecholamine B) eicosanoid C) paracrine D) peptide E) steroid - A 6. An example of an eicosanoid hormone is: A) epinephrine. B) retinoic acid. C) testosterone. D) thromboxane. E) thyroxine - D