Biochemistry 5 Views 1 Answers
Which of the following is not true of the Electron Transport Chain? a. movement through ATPase provides the energy required to resynthesize ATP from ADP and phosphate. b. is pumped into the intermembrane space of mitochondria via a series of four cytochrome complexes c. NADH and donate electrons to the ETC. These electrons provide the energy required to pump from the mitochondrial matrix to the intermembrane space of the mitochondria d. Without oxygen, the ETC is able to produce substantially greater amounts of ATP via aerobic metabolism.
Which of the following is not true of the Electron Transport Chain? a. movement through ATPase provides the energy required to resynthesize ATP from ADP and phosphate. b. is pumped into the intermembrane space of mitochondria via a series of four cytochrome complexes c. NADH and donate electrons to the ETC. These electrons provide the energy required to pump from the mitochondrial matrix to the intermembrane space of the mitochondria d. Without oxygen, the ETC is able to produce substantially greater amounts of ATP via aerobic metabolism.
Answered
The correct answer is:
d. Without oxygen, the ETC is able to produce substantially greater amounts of ATP via aerobic metabolism.
Explanation:
- a. Movement through ATPase provides the energy required to resynthesize ATP from ADP and phosphate: This is true. The movement of protons through ATP synthase (ATPase) down their electrochemical gradient provides the energy to synthesize ATP from ADP and inorganic phosphate.
- b. Protons are pumped into the intermembrane space of mitochondria via a series of four cytochrome complexes: This is true. The electron transport chain (ETC) involves a series of protein complexes (I, II, III, and IV), which pump protons from the mitochondrial matrix into the intermembrane space, creating a proton gradient.
- c. NADH and FADH2 donate electrons to the ETC. These electrons provide the energy required to pump protons from the mitochondrial matrix to the intermembrane space of the mitochondria: This is true. NADH and FADH2 donate high-energy electrons to the ETC, which provides the energy to pump protons across the inner mitochondrial membrane.
- d. Without oxygen, the ETC is able to produce substantially greater amounts of ATP via aerobic metabolism: This is false. The electron transport chain requires oxygen to function as the final electron acceptor. Without oxygen, the ETC cannot proceed, and the cell must rely on anaerobic processes (like glycolysis), which produce much less ATP compared to aerobic metabolism.
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