Unformatted text preview: 1)Its powers the active transport of molecules in and out of the cell across the external membrane 2)Bacterial locomotion uses proton gradients. Flagellum in bacteria rotates like a motor that is powered by a proton current through its drive shaft. 4. Many mammals have a specialized form of adipose tissue called “brown fat.” This tissue is full of mitochondria that are actively running electron transport chains; however, these cells also produce uncoupling agents that prevent these mitochondria from producing significant amounts of ATP. Explain, using thermodynamics, how brown fat helps these mammals to keep warm. This speed tissue can generate heat by "uncoupling" the respiratory chain of oxidative phosphorylation within mitochondria. The process of uncoupling means that when protons transit down the electrochemical gradient across the inner mitochondrial membrane the energy from this process is released as heat rather than being used to generate ATP...
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- Summer '09
- Electron Transport Chain, Adenosine triphosphate, explanatory value, Peter Mitchell, chemiosmotic hypothesis