teratoma. [terâ²ÉtÅâ²mÉ] pl. teratomas, teratomata. a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
The pink-colored film or ring frequently seen on showers, tubs, toilets and pet water bowls is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
Best Answer: Gram stain stains specific molecules in the cell wall of bacteria. Gram positive bacteria stain purple, gram negative stain pink. Since human cells lack a cell wall there is nothing to retain the purple stain. When the counter-stain, safranin is applied, the cells will be light pink. Source(s): Biology instructor for 39 years.