Question 1 / 12:  What property prevents the ligands of cellsurface 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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Biology 09 Cell Communication MCQ

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