Question

Lipids in a bilayer can diffuse laterally at a relatively fast rate, but "flip-flop" from one leaflet to the other very slowly without catalysis. Three protein families, flippases (or flipases), floppases, and scramblases, catalyze the movement of lipids across the bilayer Classify each phrase as describing flippases, floppases, or scramblases. Flippases Floppases Scramblases

Answer 1

Hi my sincere apologies as you have not provided options answer bank, so i will explain in general way that might be helpful to you classify each phrase that given to you! Please let me know still if you have any difficulties or doubts or further help at comments section below!

1) Flippases : Translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet, they are ATP dependent enzymes and they translocate phospholipids against a concentration gradient.

2) Floppases: Move phospolipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet & ABC transporter, they move substrates such as phosphatidylcholine and cholesterol against their concentration gradient.

3) Scramblases: are Not ATP-dependent, activation may result in increased membrane lipid symmetry, translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages, move phospohlipids across the lipid bilayer down the concentration gradient. Their enzymatic activity is bidirectional and depends on the calcium concentration.

ids in a bilayer can diffuse laterally at a relatively fast rate, but "flip-flop" from one leaflet to the other very Slowly without catalysis. Three protein families -flippases (or flipases), floppases, and scramblases - catalyze the movement of lipids across the bilayer. Sort each of the phrases as describing flippases, floppases, or scramblases. Choose the best, most-specific enzyme name. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more phrases are sorted incorrectly. Flippases Floppases Scramblases translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet activation may result in increased membrane lipid symmetry not ATP-dependent translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages ABC transporter move phospholipids across the lipid bilayer down the concentration gradient

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ids in a bilayer can diffuse laterally at a relatively fast rate, but "flip-flop" from one leaflet to the other very Slowly without catalysis. Three protein families -flippases (or flipases), floppases, and scramblases - catalyze the movement of lipids across the bilayer. Sort each of the phrases as describing flippases, floppases, or scramblases. Choose the best, most-specific enzyme name. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more phrases are sorted incorrectly. Flippases Floppases Scramblases translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet ABC transporter activation may result in increased membrane lipid symmetry not ATP-dependent move phospholipids across the lipid bilayer down the concentration gradient translocate phosphatidylserine, preventing apoptosis and engulfment by macrophages