what type of molecules require a transport protein to pass through the membrane?

Question

help me out pls.

Answer 1

Molecules that are essential for the cell are transported by a protein carrier system. The system is specific for certain molecules. There are two types: passive or active. The passive system transports the molecules in the direction of lower concentration. It is called facilitated diffusion. The active type transports the molecules only one way, at the expense of energy. It is called active transport.

Answer 2

For the most part, big molecules often require a transport protein to pass through the membrame .

Answer 3

non-polar have faith me, it somewhat is only too damaging for a polar molecule to ought to bypass via ability of the non-polar interior the lipid bilayer. Thats why there are such matters as Na+ok+pumps and distinctive ionic pumps/channels. The membrane is freely permeable to small nonpolar molecules. that's conventional as simple_diffusion_because it does no longer require_energy (enter)_and the water or molecules are shifting(up or down)_down_ the main purpose gradient.