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7 / 34  What property prevents the ligands of cell-surface receptors from entering the cell?
A  The molecules bind to the extracellular domain.
B  The molecules are hydrophilic and cannot penetrate the hydrophobic interior of the plasma membrane.
C  The molecules are attached to transport proteins that deliver them through the bloodstream
to target cells.
D  The ligands are able to penetrate the membrane and directly influence gene expression upon
receptor binding.

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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