1. Using the terms and diagram on the next page, explain the process of electron
ID: 132138 • Letter: 1
Question
1. Using the terms and diagram on the next page, explain the process of electron transport and oxidative phosphorylation which occurs on the inner mitochondrial membrane during cellular respiration. Foi each of the numbered locations on the diagram, write out IN SENTENCES what is happening durinjg this process. Also, the mitochondrial membrane shown separates two mitochondrial spaces. In the lettered boxes write the name of these two spaces NADH and FADH2 a. b. Electron transport chain and electrons d. ATP Synthase e. Oxygen (O2) f. Water (H2O) g. ATP h. ADP +P 1NAD 2 FADH 4Explanation / Answer
A = Mitochondrial matrix
B = Intermembrane space
Electron transport chain involves a series of carrier proteins that accept electrons/protons and ultimately pass them to molecular oxygen. They are membrane-bound proteins located in the inner mitochondrial membrane.
Oxidative phosphorylation involves oxidation of NADH and FADH2 molecule to generate a proton gradient across the inner mitochondrial membrane. This proton gradient is utilized by ATP synthase complex to synthesize ATP from ADP + Pi.
1. NADH enters ETC at complex-I
2. FADH2 enters ETC at complex-II
3. Electron transport
4. 2H+ + 1/2 O2 ----> H2O
5. Protons being pumped into the intermembrane space
6. Protons enter the mitochondrial matrix through ATP synthase complex
7. ADP + Pi --------> ATP
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