In which initial stage of animal cells does glucose break down?

The figure given below shows the steps in glycolysis. Fill in the missing steps $A, B, C, D$ and also indicate whether $ATP$ is being used up or released at step $E$?

If $3$ molecules of $PGAL$ complete glycolysis,how much $ATP$ and $NADH_2$ will be formed?

The phase common in both aerobic and anaerobic respiration is:

Which enzyme breaks down fructose-$1,6$-bisphosphate?

The common phase between aerobic and anaerobic respiration is called: