Biology  5/e   Raven/Johnson
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Cytoskeleton: The cytoskeleton is a network of fibers that provides support for the cell and anchors the organelles. Actin fibers, microtubules and intermediate filaments make up the cytoskeleton.

Cell surface receptor proteins: Receptor proteins induce changes within the cell when they come in contact with specific molecules in the environment, such as hormones.

Membrane lipid bilayer: The basis of biological membranes is the lipid bilayer. In such a layer, the nonpolar hydrophobic tails of phospholipid molecules point inward, forming a nonpolar zone in the interior of the bilayer.

Receptor-mediated endocytosis: Receptor-mediated endocytosis transports specific macromolecules into the cell. This transport is accomplished by clathrin-coated pits which close over the target molecules forming a vesicle which passes into the cytoplasm of the cell.

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