I think 68 is either A or E and I am not really sure about the other two. Please help!
67. Which of the following cofactors would be required to transfer a carboxyl group onto pyruvate to form oxaloacetate? A. thiamine pyrophosphate B. tetrahydrofolate C. ascorbic acid D. cobalamin E. biotin 68. When carbon is a limiting factor, many organisms will skip which steps in the Tricarboxylic Acid Cycle? A. the steps liberating CO2 B. the hydrolysis steps C. the formation of GTP D. the loss of CoA E. all steps producing NADH 70. In signal transduction, how can a single molecular event, or binding of an agonist, result in significant changes to cell metabolism or function? A. Through activation of enzyme cascades B. By promoting rapid changes in ion flux in/out of the cell. C. By inducing conformational changes that alter cytoskeletal interactions. D. None of these answers are correct. E. All of these answers are correct.
