How would the electron transport chain be affected if oxygen was not present in the cell?Multiple ChoiceThe electron transport chain would stop because the carrier proteins would have no way to unload electrons.The electron transport chain would stop until the cell found another source of hydrogen ions.The electron transport chain would continue, but it would produce fewer ATP per glucose molecule.The electron transport chain would continue only if glycolysis continued producing NADH.
Question
How would the electron transport chain be affected if oxygen was not present in the cell?Multiple ChoiceThe electron transport chain would stop because the carrier proteins would have no way to unload electrons.The electron transport chain would stop until the cell found another source of hydrogen ions.The electron transport chain would continue, but it would produce fewer ATP per glucose molecule.The electron transport chain would continue only if glycolysis continued producing NADH.
Solution
The electron transport chain would stop because the carrier proteins would have no way to unload electrons.
Explanation: The electron transport chain (ETC) is the final stage of aerobic respiration in which high-energy electrons are used to produce ATP, the main energy currency of the cell. Oxygen acts as the final electron acceptor in the ETC. When electrons reach the end of the chain, they are passed to oxygen. If oxygen is not present, the electrons cannot be unloaded from the carrier proteins, causing the ETC to stop. This is because without oxygen to accept the electrons, the entire process backs up and the cell cannot produce ATP, leading to cell death.
Similar Questions
Explain the significance of oxygen as the final electron acceptor in the Electron Transport Chain. What happens if oxygen is not available?
Which of the following statements about the electron transport chain and ATP production in the mitochondria is false?Group of answer choicesAny drug that inhibits the ATP synthase will also inhibit the flow of electrons in the ETC.For oxidative phosphorylation to occur, it is essential to have a membrane that is impermeable to protons except through specific proteins pores or protein complexesThe yield of ATP per mole of fuel depends on the type of molecule being catabolized.Some complexes of the respiratory chain pump protons into the matrix to create an electrochemical gradient.Exergonic electron transfer provides the energy for proton pumping.
What would happen to a plant that is treated with a chemical that prevents electrons from moving through the electron transport chain?Multiple ChoiceWater would be broken down to form oxygen at a higher rate to compensate.More electrons would be available for the light harvesting array.It could not produce NADP+NADP+ .It could not generate an electrochemical H+H+ gradient across a membrane.It could no longer produce CO2CO2 .
Which of the following statements about the electron transport chain in mitochondria is NOT correct? A) Electrons increase their free energy at each step along the transport chain B) The final electron acceptor is oxygen C) Transporters alternate between reduced and oxidized states by accepting and donating electrons D) Electron transporters are associated with the inner mitochondrial membrane E) Electrons transported along the chain come from NADH and FADH2 molecules
The purpose of the electron transport chain is to A) Accumulate electrons to store energy B) Transfer electrons in order to generate ATP C) Donate electrons to change membrane potential D) All of the above
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