(A) False. Mitochondrial ATP synthesis will cease but to compensate, cells will accelerate the production of ATP by glycolysis, preventing ATP levels from dropping to zero.
(B) False. The acceleration of glycolysis will increase the rate of glucose consumption.
(C) False. The rate of oxygen consumption will decrease because electron transfer through respiratory chain is tightly coupled to ATP synthesis, blocking ATP synthase which blocks electron flow and oxygen consumption.
(D) False. The citric acid cycle is an oxidative pathway, producing NADH. When electron flow from NADH to O2 is blocked, NADH accumulates, NAD+ is depleted and citric acid cycle slows for lack of an electron acceptor (NAD+).