nucleus
All living cells are surrounded by a cell membrane. Plant cells Figure 17.3 "An Idealized Plant Cell" and animal cells Figure 17.4 "An Idealized Animal Cell" contain a cell nucleus that is also surrounded by a membrane and holds the genetic information for the cell. For more information about genetics and DNA, see Chapter 19 "Nucleic Acids". Everything between the cell membrane and the nuclear membraneincluding Saylor URL: http://www. saylor. org/books.