TASC Biology Level 3 Practice Questions - TASC Biology Level 3 (Course Code BIO315124) Exam

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Which statement accurately describes the active transport mechanism executed by the sodium-potassium pump (Na+/K+ ATPase)?

It hydrolyzes one ATP molecule to pump 3 Na+ ions out of the cell and 2 K+ ions into the cell against their respective concentration gradients. It uses passive channel proteins to allow 3 Na+ ions to diffuse into the cell for every 2 K+ ions diffusing out. It transports 2 Na+ ions into the cell and 3 K+ ions out of the cell without expending cellular metabolic energy. It actively transports Na+ and K+ ions in equal numbers out of the cell to establish an isotonic cytosolic state.

Correct Answer:

It hydrolyzes one ATP molecule to pump 3 Na+ ions out of the cell and 2 K+ ions into the cell against their respective concentration gradients.

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