Aerobic Respiration
Chapter Name : Respiration In Plants |
Sub Topic Code : 103_11_14_04_02 |
Topic Name : Aerobic Respiration |
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Sub Topic Name : Electron Transport System (ETS) And Oxidative Phosphorylation |
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Introduction
Embedded in the inner membrane are proteins and complexes of molecules that are involved in the process called electron transport. The electron transport system (ETS), as it is called, accepts energy from carriers in the matrix and stores it to a form that can be used to phosphorylate ADP.
Real Life Question:
Why do plants need energy?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
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| Ubiquinone | Any of a class of compounds that occur in all living cells and that act as electron-transfer agents in cell respiration. They are substituted quinines. |
Learning aids / Gadgets
| Gadgets | How it can be used |
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| Encyclopedia | Read about ETS and oxidative phosphorylation. |
Places to visit :
Library
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
The electron transport system occurs in the cristae of the mitochondria, where a series of cytochromes (cell pigments) and coenzymes exist. These cytochromes and coenzymes act as carrier molecules and transfer molecules. They accept high-energy electrons and pass the electrons to the next molecule in the system. At key proton-pumping sites, the energy of the electrons transports protons across the membrane into the outer compartment of the mitochondrion. Each NADH molecule is highly energetic, which accounts for the transfer of six protons into the outer compartment of the mitochondrion. Each FADH2 molecule accounts for the transfer of four protons. The flow of electrons is similar to that taking place in photosynthesis. Electrons pass from NAD to FAD, to other cytochromes and coenzymes, and eventually they lose much of their energy. In cellular respiration, the final electron acceptor is an oxygen atom. In their energy-depleted condition, the electrons unite with an oxygen atom. The electron–oxygen combination then reacts with two hydrogen ions (protons) to form a water molecule (H2O)