The electron transport chain (ETC), or respiratory chain, is linked to proton mo

Question

The electron transport chain (ETC), or respiratory chain, is linked to proton movement and ATP synthesis. Select the statements that accurately describe the electron transport chain. Choose all that apply. Electrons generated by the citric acid cycle in the intermembrane space enter the ETC. The inner membrane of mitochondria is readily permeable to small molecules and hydrogen ions. Prosthetic groups, such as iron-sulfur centers, are directly involved with electron transfer. Electron carriers in the ETC include ubiquinone (coenzyme Q) and cytochrome c. Electron carriers are organized into four complexes of proteins and prosthetic groups. The reactions of the ETC take place in the inner membrane of mitochondria. Electron transfer in the ETC is coupled to proton transfer from the matrix to the intermembrane space.

Explanation / Answer

Answer: Choices 1, 2, 3, 4, 7

Explanation: The electron tranpsort chain or ETC is composed of 4 groups, each carrying a transfer-molecule such as uniquinone and cytochrome c along with others. The electrons enter the ETC via citric acid cycle. The fifth part of the ETC is the ATPase where ATP generation takes place. Prosthetic groups containing Fe-S as core ions remain the major executioners of the ETC. All these reactions take place in the inner membrane of the mitochondria towards the matrix.

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