Question

Select the characteristics that correctly describe uniporters and ion channels. Ion channels act as enzymes. ✓ Movement of ions or molecules is more rapid through the channels than the unip Movement of ions or molecules is more rapid through the uniporters than the cha Ion channels act as pores in a membrane. ✓ Uniporters act as enzymes. Uniporters act as pores in a membrane. about us Careers privacy policy terms of use conta

can some explain this?

Answer 1

Answer :

Ion channels are transmembrane protein complex that allow ions to pass through the central channel pore.Ion channels allow movement across concentration gradient.They can allow movement of millions of ions per second . These channels catalyse transmembrane flux of ions thus showing that ion channels act as enzyme .

Uniporter is a membrane protein that binds a single type of substrate molecule and transfers it according to concentration gradient. Uniporter a transport protein increases the rate of transport to many times thus acts as enzyme for the process.

Ions flow freely through ion channels along concentration gradient like simple diffusion (only difference is that it is facilitated while simple diffusion is non facilitated) . Whereas uniporter binds to single molecule at a time as substrate . Thus movement through ion channels are faster as compared to uniporter.

Hence correct options are

* Ion channels act as enzymes

* Movement of ions or molecules is more rapid through the channels than the uniport

* Ion channels act as pores

* Uniporters act as enzymes

Transport of molecules across cell membrane facilitated Diffusion Active Transport Passive simple diffusion » Along concentration Along concentration gradient gradient > inot Concentrahton - gradient With involvement of special channels or prutens which require energy/AIP for their operation → Without With involvement involvement of any channel of channel or - Carrier protein or carrier protein - Small molecules like Ozando, larger molecules like aminoacid Passive process ice they do not require energy

Types of carrier protein -1 Unipoot dysport Antiport A B 5 -Cellmembrane - Cell membrane Cell membrana : single type of soolecule transported in a particular direction Two molecules transported in a particular direction Two molecules transported en opposite direction,