For the 3 central metabolic pathways (glycolysis, transition
step, and transition step, and Krebs cycle ) and cellular
respiration using the electron transport chain, state the principal
starting substrate, the end product (if there is one), the amount
of ATP generated by substrate-level phosphorylation, and the amount
of ATP that can be generated through reducing power. Compare and
contrast substrate levels and oxidative phosphorylation. What
happens in prokaryotes that lack an electron transport chain? How
do they generate ATP?