Which statement is correct about the krebs cycle? a. oxygen is a waste product of the krebs cycle. b. acetyl-coa combines with pyruvic acid to make glucose in the krebs cycle. c. the krebs cycle produces electron carriers for the electron transport chain d. in the krebs cycle, carbon dioxide is used to make glucose.

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.