Question

Like humans, yeast (Saccharomyces cerevisiae) can store sugar in the form of glycogen. Thus when glucose is in short supply, glycogen can be broken down and its subunits can enter glycolysis. Use the following picture of a small glycogen molecule to assist when answering this question. Before baking bread it is often customary to pre-soak the yeast in water. In this water environment there is no simple sugar nor complex starches for the yeast to use as an energy source and thus they must rely on glycogen storage polymers. Also recognize that during this pre-soak the yeast are exposed to plenty of Q. If one of these yeast cells completely catabolizes the glycogen molecule pictured above, how many ATP can it net from the glucose subunits via oxidative phosphorylation? Please assume that the cytosolis NADH produced in glycolysis nets only 2 ATP/NADH c. 816 ATP d. 912 ATP e. 96 ATP f. 768 ATP

Answer 1

Biology textbooks often state that 38 ATPmolecules can be made per oxidized glucose molecule during cellular respiration (2 from glycolysis, 2 from the Krebs cycle, and about 34 from the electron transport system).

number of ATP formed = 38 ×24 = 912

option d is correct