ATP formation by substrate-level phosphorylation (like in glycolysis and Krebs cycle) utilizes _________________, while ATP formation by oxidative phosphorylation utilizes ______________.
A) a phosphate group transfer from a substrate; the electron transport chain
B) the electron transport chain; a phosphate group transfer from a substrate
C) the breakdown of glucose; the citric acid cycle
D) the citric acid cycle; the breakdown of glucose
