Teaching MPPSC Assistant Professor Mock Test Series 2025 Life Sciences Cellular Organization Membrane structure and function
Which of the following statements is true regarding the role of flippase, floppase, and scramblase in the movement of lipids across the phospholipid bilayer?
1
Flippase requires ATP to move lipids from the outer to the inner leaflet, while floppase and scramblase do not require ATP for their action.
2
Scramblase catalyzes the ATP-dependent transfer of phospholipids from the inner to the outer leaflet, maintaining the asymmetric distribution of lipids
3
Both flippase and floppase are ATP-dependent enzymes; however, flippase moves phospholipids from the outer to the inner leaflet, while floppase does the opposite.
4
Floppase facilitates the bidirectional movement of phospholipids across the membrane in an ATP-independent manner, contributing to the membrane's fluidity and asymmetry.