three classes of largest cell surface receptors are

G linked receptors
Tyrosine kinase receptors
Ion channels

the difference between ion channels and carrier proteins which made use of nuclear receptors.
the former one has a transprot rate of 10 to the power of 5 times faster than any carrier protein
it act through passive transport, ions diffuse rapidly across the membrane based on their electrochemical gradients.

to be continue..


i m going crazy....