These components are organized into three major layers: the primary cell wall, the middle lamella, and the secondary cell wall (not pictured). The cell wall surrounds the plasma membrane and ...

This primary infection results in the production of memory cells that remain in the bloodstream. A second exposure to the same pathogen causes the white blood cells to respond quickly in order to ...

The primary market refers to the market in which securities are created. The secondary market is one in ... It was most likely derived from the off-Wall Street trading that boomed during the ...