Question

Compare channel and carrier transport proteins.

Answer 1

Channels are transmembrane proteins which are involved in the transport of molecules from one side to another side. channels are composed of proteins which are present in the integral form in the membrane.

they are present as a channel and opens when the sell need to transport the molecules.

channels are of two types: gated channels and non gated channels.

Gated channels: these are those channels which have gates for opening and closing.

Non gated channels: These are the channels which doesn't have gates for opening and closing.

Gated channels are of two types:

open gated channels

closed gated channels

Open gated channels are those channels at which gates are always open. They are also known as leak channels.

closed gated channels: These are the channels which are generally closed. They only opens when any stemuli comes.

Clodsed gated channels are: Ip3 gated channels, ligand gated channels and voltage gated channels.

they opens up when votage changes or Ip3 as second messangers come.

Carrier proteins:

These are protein molecules which bounds to the transported molecule and deliver to the target location. They binds to the molecule and then transfers it to the targate point.

Career proteins have limitations for binding site. They only binds with the molecules with the available bonding site. They transport molecule by binding with it and then release.

When concentration of molecules is increased then channels will saturate and carriers can not saturate at any point they just bind and release.