Which is the best definition of the term ligand?
A)A receptor composed of protein
B)A molecule or ion that binds to a protein
C)Any molecule found in the intracellular fluid
D)Any molecule found in the extracellular fluid
E)A carbohydrate molecule that binds weakly to membrane phospholipids

Question

Quizplus · Accepted Answer

A ligand is a molecule or ion that binds to a protein, usually a receptor. This binding initiates a biological response in the cell. Option A is incorrect as a receptor is not the same as a ligand. Option C and D are incorrect as ligands are not limited to intracellular or extracellular fluids. Option E is incorrect as carbohydrates are not the only type of molecule that can act as ligands.

Which Is the Best Definition of the Term Ligand