Which protein complex can pump H+ in both directions (‘uphill’ or ‘downhill’) ? What is the...
Which protein complex can pump H+ in both directions (‘uphill’ or ‘downhill’) ? What is the role of ‘uphill’ proton pump? What is the source of energy for ATP generation by ATP synthase?.
Homework Answers
A uphill proton pump is the one which cause the transport of molecules from a low-concentration region to a high-concentration region. It must be coupled to another spontaneous process to transport charged or uncharged substrates against their thermodynamic forces.
Proton motive force generated during electron transport chain is used by ATP synthase to synthesize ATP.
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Which protein complex can pump H+ in both directions (‘uphill’
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Lysosomes and endosomes both have an ATP-driven H+ pump. The pump is needed for: Maintenance of the electron transport chain pH control - enzymes and receptors in the 2 organelles need an acidic environment pH control - the cytosol is too acidic for these organelles to function correctly. the maintain the proton-motive force that surrounds these organelles
28.(2 pts) What are 2 types of protein assemblies that plant cells can use to translocate solute particles? 29. (2 pts) If the observed cellular concentration of an ion does not agree with the Nernst equation predicted level, what is one cellular mechanism that could be responsible? 30. (4 pts) What type of active transport directly uses ATP energy to pump a solute against its concentration gradient? Which type relies on a proton-motive force?
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