Definition of Mycoplasma
选项：

A:It is a unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle.
B:It is the smallest and simplest self-replicating prokaryote.
C:It is an irregularly shaped region within the cell of a prokaryote that contains all or most of the genetic material.
D:Cells have a cell nucleus and other organelles enclosed within membranes.
E:It is folded invaginations in the plasma membrane of bacteria.