Receptor structure is made more viscous by the lipid bilayer in which it sits

Receptor structure is independent of the amino acid sequence in polypeptides

Receptor structure determines specificity of the binding of ligands and agonists

Receptor structure is stabilized by the insertion of cholesterol

Receptor structure is determined by the affinity of antagonists

Only required if the receptor has high affinity

Conferred by the shape of the receptor's binding site for ligands

Only required if the receptor needs to saturate rapidly

Only required if the receptor needs to be selective to activate a specific G protein

Only required if the receptor needs to be selective to allow the movement of a specific ion

Membranous vesicles

The nucleus

The endoplasmic reticulum

The smooth endoplasmic reticulum only

The rough endoplasmic reticulum only

Current flow at AP channels is usually bidirectional

Current flow at gap junction channels is always bidirectional

Current flow at gap junction channels is usually bidirectional

Current flow at gap junction channels is always unidirectional

Current flow at both channels is usually bidirectional

If the receptor is a polypeptide chain

If the receptor has specificity

If the receptor is a protein

If the receptor has affinity

Always

Can only be unidirectional, because the channels involved show high affinity to one ion 

Can be bidirectional, depending on the electrical gradient

Can be bidirectional, depending on the gradient for uncharged small particles

Can only be unidirectional, because channels are specific to the ion involved

Can only be bidirectional even though the channels involved show high affinity to one ion 

Are membrane-bound receptors for extracellular ligands

Are membrane associated proteins that can activate different intracellular proteins

Are membrane associated proteins that can bind extracellular ligands

Are integral membrane receptors for intracellular ligands

Are integral membrane receptors for extracellular ligands

Rapid plasticity

Ability to amplify signal

Present only in neurons

Short-term flexibility

Fast response time

Are used for both synaptic and non-synaptic signalling by the lipid-soluble chemical signals

Have to be membrane-bound to allow the rapid movement of ions

Are always linked to membrane cholesterol to be held in place rigidly.

Are intracellular receptors that either bind to DNA or activate 2nd messengers.

Have to be membrane-bound to prevent the signals from being absorbed into the membrane lipid bilayer .