Question

During the first three steps of the aerobic cellular respiration, what is the ONLY element that is consistently stripped from the reactant glucose? (The options are Carbon, Hydrogen or Oxygen)

Answer 1

Answer should be hydrogen.

The reason is -In the very first step glucose is converted to glucose 6 phosphate. In this step the OH group attached to the 6th carbon of glucose is ripped of an H atom and phosphate group becomes attached to it.

Next step is neutral in terms of H transfer.

In the third step fructose 6phosphate is converted to fructose 1,6 bis phosphate.

Here the same thing happens with the 1st carbon of fructose H is removed from OH of first carbon and phosphate group is attached making it fructose 1,6bis phosphate.