In a first pregnancy, Rh sensitization is not likely. Usually, it only becomes a problem in a future pregnancy with another Rh positive baby. During that pregnancy, the mother's antibodies cross the placenta to fight the Rh positive cells in the baby's body.
Definition of Lysosome. Lysosome: An organelle (a little organ) in a cell containing enzymes that degrade macromolecules (large molecules) and other items (such as bacteria) taken up by a cell during the process of endocytosis.
Structure of Lysosomes. 1  The outer surface is formed by a single membrane, a phospholipid bilayer that can fuse with some other membrane-bound organelles. 2  Approx. spherical shape of diameter ranging up to one micrometre (1 Î¼m). 3  A single lysosome contains many enzyme molecules.