Chemical: Chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.
Nuclear: Nuclear energy comes from splitting atoms in a reactor to heat water into steam, turn a turbine and generate electricity.
Kinetic: Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy.
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Functions of cell surface Receptors .
most ligands responsible for cell-cell signaling ( including neurotransmitters, peptide, hormones, and growth factors) bind to receptors on the surface of their target cells.