UNIKIN Medicine Admission Concours Practice Questions - Université De Kinshasa Faculté De Médecine Concours D'Admission Exam

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The plasma membrane sodium-potassium pump (Na+/K+-ATPase) operates with which precise ionic stoichiometry and electrogenic result per hydrolyzed ATP molecule?

Transports 2 Na+ ions out of the cell and 3 K+ ions in, generating an intracellular positive charge Transports 3 Na+ ions out of the cell and 2 K+ ions in, generating an intracellular net negative current Transports 3 Na+ ions into the cell and 3 K+ ions out, maintaining electroneutrality Transports 1 Na+ ion out of the cell and 1 K+ ion in, with no net current generation

Correct Answer:

Transports 3 Na+ ions out of the cell and 2 K+ ions in, generating an intracellular net negative current

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