<span>The interior of a cell is called the cytoplasm. </span>
Hello!
Don't hold me on it, but I think your answer would be A, bacteria.
Enjoy.
~Isabella
Answer:
The type of protein that binds a ligand on the cell surface or within cells are transmembrane receptors. These proteins have 3 domains: an extracellular part that does the binding, a hydrophobic domain that extends through the membrane, and an intracellular region that transmits the signal. The most common membrane-anchored receptors are: G protein-coupled receptors, receptor tyrosine kinases, and ligand-gated ion channels.
Answer:
cell membrane
Explanation:
the cell membrane protects the cell from going anywhere or anything coming inside
