Explain net water movement between solutions separated by a selectively permeable membrane and the role of water channels.
Tę umiejętność sprawdza 5 zadań wzorowanych na arkuszach IB z lat 2022–2026.
A membrane contains aquaporin proteins. What role do they perform? A. They hydrolyse ATP to pump water against its potential gradient B. They attach water covalently to phospholipid tails C. They act only on the external membrane surface D. They provide…
(i) Explain why the treated cells and control cells show different changes in volume. (ii) Discuss how aquaporins in human collecting ducts help when blood water content becomes too low.
Suggest why a fluid-secreting gland cell may have many aquaporins in its plasma membrane.
An isolated mammalian muscle cell is transferred from its usual medium to a hypotonic medium. Explain the changes expected in the cell.
Membrane transport and kidney function contribute to water and solute balance. (a) Outline four different ways substances cross the plasma membrane, giving an example for each. (b) Explain how kidney regions contribute to water balance and excretion of…
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