28.Which of the following types of DNA are often supercoiled?(A) extremely long linear DNA, such as seen in human chromosomes(B) very short linear DNA(C) circular DNA(D) DNA molecules that contain both circular and linear regions(E) all of the above

3. When glucagon binds to its receptor on a liver cell, which of the following sequence of events occurs 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

28.Which of the following types of DNA are often supercoiled?
(A) extremely long linear DNA, such as seen in human chromosomes
(B) very short linear DNA
(C) circular DNA
(D) DNA molecules that contain both circular and linear regions

(E) all of the above

相關試題

相關試卷