Zadanie 3
Which labelled regions in this membrane model are hydrophilic? A. I and II B. III and IV C. I and III D. II and IV
- Materiał graficzny
The membrane's hydrophobic barrier
Predict which particles cross a lipid core poorly from their size, polarity and electrical charge.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2023–2024.
Zadania sprawdzające tę umiejętność: 6 Otwórz w wyszukiwarce z filtrami
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 6
A cell in a freshwater organism is bounded by a phospholipid membrane. (a) Outline how phospholipid properties determine the membrane’s structure. (b) Describe the movement of substances through the membrane by facilitated diffusion. (c) Explain how electrical…
Zadanie 25
Amylase hydrolyses starch into maltose. A closed length of standard dialysis tubing contains starch and amylase, with no maltose initially. It is placed in distilled water as shown. Predict the changes after 45 minutes. Each answer lists: starch outside;…
- Materiał graficzny
Zadanie 25
Amylase hydrolyses starch into maltose. A closed length of standard dialysis tubing contains starch and amylase, with no maltose initially. It is placed in distilled water as shown. Predict the changes after 45 minutes. Each answer lists: starch outside;…
- Materiał graficzny