Question

Any signal or ligand protein can bind any receptor protein and activate signaling.

Is this true or false

Answer 1

False,Not all signals bind to receptor protein to activate signalling.

Some specific signal or ligand protein bind the receptor protein. Ligands include substrates, inhibitors, activators, signaling lipids, and neurotransmitters. Ligand binding to a receptor protein alters the conformation by affecting the three-dimensional shape orientation. The conformation of a receptor protein composes the functional state. When a signal molecule binds to a receptor protein, the protein changes shape, which triggers changes in the cell membrane. The cell may respond to a signal by changing its membrane permeability, by activating enzymes, or by forming a second messenger. Binding of the signal molecule to the receptor protein will activate intracellular signaling proteins that initiate a signaling cascade.

Types of signaling molecules and the receptors they bind to on target cells are Intracellular receptors, ligand-gated ion channels, G protein-coupled receptors, and receptor tyrosine kinases.