Zadanie 3b
Molecules move across the plasma membrane by several routes. Describe three distinct membrane-transport processes.
Determinants of membrane permeability
Compare physical limits on simple diffusion with the molecular selectivity of channels and pumps.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Zadania sprawdzające tę umiejętność: 6 Otwórz w wyszukiwarce z filtrami
Zadanie 4c
An absorbed monosaccharide crosses an epithelial membrane through a transport protein without ATP use. Outline how facilitated diffusion moves the solute.
Zadanie 3
Which substance–route pairing correctly describes movement through a cell membrane? A. Testosterone — directly through the lipid bilayer B. Starch — through an aquaporin C. A sodium ion — freely through the hydrophobic core D. A large antibody — through a…
Zadanie 4
Glucose moves into a cell down its concentration gradient through a glucose carrier. Why is a membrane protein needed? A. Every downhill movement requires ATP hydrolysis B. Glucose is too non-polar to enter a lipid layer C. The carrier reverses the glucose…
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 3
Which combination describes the requirements and energy use of facilitated diffusion? A. A suitable protein and a gradient, with no direct ATP use B. A protein and ATP hydrolysis, always against the gradient C. ATP hydrolysis without any membrane protein D. A…