U2) Active Transport 0.0 / 5 ? BiologyCellular processesA2/A-levelAQA Created by: lieselb12Created on: 05-05-20 10:54 What is active tranpsort? Movement of molecules and ions against a concentration gradient. 1 of 11 What is the gradient? From low to high 2 of 11 Does it require energy? Yes 3 of 11 Where does this energy come from? ATP hydrolysis 4 of 11 What must it use? Carrier protein 5 of 11 What can actively transport 2 molecules in opposite directions at the same time? Na+/K+ pump 6 of 11 What are the 5 factors that affect AT? Concentration gradient / Surface area / pathway length / Rate of respiration ( ATP production) / Speed of carrier protein 7 of 11 Describe the 4 part process? - 1 1-molecule/ion binds to carrier protein receptor site 8 of 11 2- ATP binds to carrier protein and is hydrolysed to ADP and Pi 9 of 11 3- Phosphate group phosphorolates Carrier protein + changes its shape so molecule/ion is released. 10 of 11 4- Phosphate group reforms ATP with ADP as Pi is released + carrier protein returns to original shape. 11 of 11
The epithelial cells that line the small intestine are adapted for the absorption of glucose. Explain how. 0.0 / 5
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