The function of the aldolase enzyme during respiration is to catalyze the conversion of fructose-$1,6$-bisphosphate into phosphoglyceraldehyde and dihydroxyacetone phosphate. What is the specific role of aldolase in this reaction?

Explain the formation of $PEP$ (Phosphoenolpyruvate) during glycolysis.

Glycolysis:
$I$. Causes partial oxidation of glucose (one molecule) to form $2$ molecules of pyruvic acid and $2$ $ATP$ as net gain.
$II$. Takes place in all living cells.
$III$. Uses $2$ $ATP$ at two steps.
$IV$. Scheme was given by Gustav Embden,Otto Meyerhof,and $J$. Parnas.
Choose the correct option containing appropriate statements from the above.

The end product of glycolysis is

In which of the following processes does the isomerization step take place?

Describe the first stage of respiration.