- The energy stored in reduced coenzymes is used to set up a proton gradient by way of the electron transport chain. This gradient sets up the equivalent of a battery within the mitochondria. As charges move, the work that is done can be used to make ATP. - Energy released from the electrons of reduced coenzymes is used to set up a proton gradient. Proteins embedded in the inner mitochondrial membrane can accept electrons from the NADH + H+ and FADH2 to make NAD+ and FAD and use the energy lost from those electrons to pump protons into the intermembrane space. - Electrons are transferred from protein to protein in the electron transport chain. Each successive protein in the transport chain can accept a lower-energy electron. As electrons travel from a high-energy state to a low-energy state, energy is released. This energy is used to pump protons across the membrane to set up a gradient. The final electron acceptor is oxygen (O2). Oxygen has a high electronegativity; thus, oxygen’s high affinity for electrons makes it an ideal acceptor for low-energy electrons. With the electrons, hydrogen is added to oxygen forming water as the final product.

Assume that a eukaryotic cell has a full supply of glucose and oxygen, but needs ATP. In the mitochondria of this eukaryotic cell, a proton gradient will be geneated by ____________ and this gradient will be used for ____________ .

- the electron transport chain; ATP synthesis

As electrons are passed in the electron transport chain, hydrogen ions (protons) are pumped from _____ to _____.

- mitochondrial matrix ; mitochondrial intermembrane space

Which statement about the electron transport chain is false?

- It operates at the same time in the cell as fermentation

4.4.1 The Electron Transport Chain Flashcards by Irina Soloshenko

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4.4.1 The Electron Transport Chain Flashcards

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