What is the difference between a substrate, ligand, reactant and product?
A ligand , in biology, is a molecule that binds to another. Often, a soluble molecule such as a hormone or neurotransmitter that binds to a receptor.
Here growth factor efficacy is increased with ligand/receptor binding.
Ligand, in chemistry, any atom or molecule attached to a central atom, usually a metallic element, Here copper is the ligand.
The word is used in ligature (something that binds two or more thing together). Actually handcuffs are ligatures.
A substrate is a molecule upon which an enzyme acts. The substrate is changed by the reaction and, in this case, two products are made.
A reactant and substrate have the same meaning. The term reactant is more often used in chemistry.