27) Which of the following techniques was used to determine the double helical structure ofDNA?(A) NMR spectroscopy(B) X-ray diffraction(C) Raman spectroscopy(D) UV/Vis spectroscopy(E) IR spectroscopy

3) When glucagon binds to its receptor on a liver cell, which of the following sequence of eventsoccurs to activate protein kinase A?(A) activation of adenylate cyclase, activation of G protein, production of cAMP(B) activation of G protein, activation of adenylate cyclase, production of cAMP(C) activation of G protein, production of cAMP, activation of adenylate cyclase(D) production of cAMP, activation of adenylate cyclase, activation of G protein(E) none of the above

27) Which of the following techniques was used to determine the double helical structure of
DNA?
(A) NMR spectroscopy
(B) X-ray diffraction
(C) Raman spectroscopy
(D) UV/Vis spectroscopy

(E) IR spectroscopy

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