Zadanie 3b
Molecules move across the plasma membrane by several routes. Describe three distinct membrane-transport processes.
Direct diffusion through a lipid bilayer
Explain the net movement of oxygen and carbon dioxide across membranes down concentration gradients.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2023–2025.
Zadania sprawdzające tę umiejętność: 7 Otwórz w wyszukiwarce z filtrami
Zadanie 3c
Explain how changing extracellular oxygen concentration affects net diffusion into a cell when other factors are constant.
Zadanie 2b
A sealed dialysis bag containing starch and glucose is immersed in water. Later the surrounding water tests positive for glucose and negative for starch. Explain how the model represents intestinal absorption.
- Materiał graficzny
Zadanie 7
Why does binding oxygen to haemoglobin increase the oxygen-carrying capacity of blood compared with plasma alone? A. Non-polar oxygen dissolves only sparingly in the aqueous plasma B. Haemoglobin makes oxygen substantially more soluble in the water of the…
Zadanie 7
Water and dissolved substances connect the functioning of cells with the physical conditions of oceans. (a) Outline properties of water, linking each to its importance for living organisms. (b) Describe how water-soluble molecules and ions pass across cell…
Zadanie 11
Suggest two factors that could affect antibiotic action on this community.
- Materiał graficzny
Zadanie 19
Liver cells (hepatocytes) exchange substances with blood in adjacent sinusoids. Some substances are detoxified inside the cells before the resulting products are transported elsewhere. Draw arrows showing (i) the movement of oxygen to a hepatocyte, and (ii)…
- Materiał graficzny