Cells are the basic building blocks of all living things. All cells are small 'sacks' composed mostly of water. There are millions of different types of cells, but they are divided into two main groups. The first group, Prokaryotes, is made up of very small cells that have no membrane around their nucleus and no organelles with membranes. Prokaryotes include bacteria and are the most common type of cell. The second group of cells is …showed first 75 words of 1639 total…

…showed last 75 words of 1639 total…html/vacuole.htm http://www.monroe.k12.fl.us/csh/Departments/CSHS-Science/Biologytemp/cellmaster http://www.personal.psu.edu/users/a/m/amn244/vacuoles.html http://www.tiscali.co.uk/references/encyclopaedia/hutchinson/m0015140.html http://www.tudsb.on.ca/westmin/science/sbi3al/Cells/vacuole.htm Seawood Site c. 1995-2002. Michael D. Guiry. Available online at http://seawood.ucg.ie/firstyears/vacuoles.html www.sciencenet.org.uk/database/Biology/Cell_Biology/b00309c.html