What is the role of fadh2 in cellular respiration

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To hold and carry the high-energy electrons from glucose to the electron transport chain of the inner mitochondrial membrane.

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The correct option is this: THEY EITHER MATCH UP WITH A RECEPTOR MOLECULE ON THE SURFACE OF THE CELL OR ENTER THE CELL THROUGH THE MEMBRANE.
Intercellular communicatiion between cells occur in several ways, one of these is through the use of chemical signals. The cell membrane is a semi permeable structure and only allow the passage of specific substances. If the cell membrane allows the chemical signal to pass through, then the signal will enter the cell through the cell membrane. If the cell membrane is not permeable to the chemical signal, the signal can be transported into the cell by means of carrier proteins which are found on the surface of the cell membrane.