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2-1, 2-2, 2-3

2-1) virus a microscopic particle made by either a DNA or an RNA core and covered with a protein coat; it infects host cells in order to reproduce
2-1) vaccine a solution made from damaged virus or bacteria particles or from killed or weakened viruses or bacteria; can prevent, but not cure, many viral and bacterial diseases
2-2) AIDS acquired immune deficiency syndrome, a fatal communicable disease caused by the HIV virus: destroys the body's ability to combat disease
2-3) compound light microscope an instrument that uses light and convex lenses to magnify objects
2-3) electron microscope an instrument that bends beams of electrons in a magnetic field; magnifies objects too small to be seen with a light microscope
2-3) cell theory a major theory of life science the cell is the basic unit of life; organisms are made up of one or more cells; and all cells come from other cells
Created by: Lekaiah