When tissues are injured or infected, chemical signals can be releases that affect the plasma membrane of cells that line the nearby blood vessels. these blood vessels' cells (endothelial cells) respond to the chemical signals by displaying a type of glycoproteins on their surface. these proteins will attach to circulating white blood cells bringing them to the site of injury or infection. these glycoproteins would best be described as

The correct answer is: Cell Adhesion Molecules      

Explanation:

The cell adhesion molecules are the type of protein molecules that are involved in the process of cell adhesion and are found on the surface of the cell. These molecules assist the cells to get attached or adhere to other cells or the surrounding extracellular matrix.

These molecules are the single-pass transmembrane receptors which are composed of the intracellular, extracellular and the transmembrane domains.

Therefore, in the given example the glycoproteins are the cell adhesion molecules.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."