Cells in a large multicellular organism communicate with each other by chemical signals. these signals are passed from one cell to another. to receive and respond to a chemical signal, a cell must have a for that chemical.

The cell to cell communication is performed by certain chemical signals in the multi-cellular organisms. The chemical signal is perceived by the cell with the help of receptor. The signalling molecule binds to receptor thereby generating a response. The signalling molecule can only bind to a specific receptor. For example, nerve growth factor can only bind with nerve growth receptors and insulin binds only with insulin receptor.  

Thus, To receive and respond to a chemical signal, a cell must have a receptor for that chemical.

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Cell to cell signalling

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for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .