In a mitochondrion, the TCA cycle cannot continue on indefinitely without oxgen

Question

In a mitochondrion, the TCA cycle cannot continue on indefinitely without oxgen because the electron transport chain will be incapable of regenerating NAD+ and FAD. True False Buildup of the pH gradient can occur in the electron transport chain even when the electron transport is abolished True False Elimination of the proton gradient in the chloroplast will result in failure to produce ATP. True False The pH gradient established by the electron transport chain: Exists between the matrix and the mitochondrial intermembrane space Sets up a voltage gradient that drives GTP formation Is established by electron transfer from FADH2 and NADPH from the TCA cycle to oxygen Occurs because Fe-S clusters can only transport protons and not electrons All of the above

Explanation / Answer

Q.1

In a mitochondrian TCA cycle cannot continue on indefinitely without oxygen because the electron transport chain will be incapable of recognizing NAD+ and FAD

False

Electron transport chain in cellular respiration will take the energy stored in NADH and FADH2 NADH and FADH2 lose their electrons, energy from those electrons is used to produce ATP. These electrons will move through a series of proteins in the membrane, which make up the electron transport chain. The oxidized NAD+ and FAD are then able to accept more electrons from the Krebs cycle to keep the process going. Oxygen is not needed in the Krebs cycle itself but rather at the end of the electron transport chain, where it is the terminal electron acceptor. Electrons flowing through the proteins of the electron transport chain must have something to receive them at the end. If not, the flow of electrons is blocked. Oxygen atom pick electron combine with H+ to from water.

Q.2

Build up the PH gradient can occur in the electron transport chain even when electron transport chain abolished

False

pH gradient can develop only if the membrane is permeable to a major anion or if the protons are exchanged for another cation.

Q.3

Elimination of the proton gradient in the chloroplast will result in failure to produce ATP

True

An ATPase located in the membrane utilizes the proton gradient for the synthesis of ATP.

Q.4

The PH gradient established by the electron transport chain is

Exists between the matrix and the mitochondrial inter-membrane space

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