In respiration some molecules are essential precursors the n

In respiration some molecules are \'essential precursors\': the new cell must already include at least one copy of this molecule in order to begin aerobic respiration from glucose molecules. What is an example of a molecule that is an essential precursor and an example of a non-essential precursor and why?

Solution

ATP is an essential precusor.

ATP is a source of phosphorylation and is required for the first step of glucose catabolism for the respiration to continue.

Dihydroxy acetone phospate (DHAP) was found to a non essential precursor for the respiration to take place.