Zadanie 2d
The mean results are shown. Use membrane structure to explain the relationship.
- Materiał graficzny
Membranes and membrane transport
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 46 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 33 z 54 arkuszy w bazie.
Zadania z tego działu: 46 Otwórz w wyszukiwarce z filtrami
Zadanie 9
An animal’s survival depends on how its structures and behaviour fit its surroundings. (a) Outline how animal membranes can maintain suitable fluidity in habitats with contrasting temperatures. (b) Describe adaptations that allow herbivores to obtain plant…
Zadanie 14
At constant temperature, I represents simple diffusion and II represents channel-mediated diffusion. Which interpretation of the labelled positions is valid? A. At W, the particles have lost most of their thermal energy B. At X, the finite number of channels…
- Materiał graficzny
Zadanie 15
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…
Zadanie 2b
(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.
- Materiał graficzny
Zadanie 3b
State one other category of gated ion channel.
Zadanie 3c
Outline why the phospholipids forming the bilayer are described as amphipathic.
Zadanie 3d
Outline how cholesterol affects membrane fluidity.
Zadanie 3e
Outline how fatty-acid saturation influences membrane fluidity.
Zadanie 9
A eukaryotic cell depends on membranes to organize reactions, exchange materials and respond to signals. (a) Discuss the benefits of membrane-bound compartments. (b) Describe mechanisms that move materials across the cell boundary. (c) Explain how axon…