1.  Chapter 4

2.  Section 1

6.  Schleiden concluded: 1838 - All plants were composed of cells  Schwann concluded: 1839 - All animals were composed of cells  Virchow concluded: 1855 - All cells come from other cells

7. 1. All living organisms are composed of at least 1 or more cells 2. Cells are the basic unit of life 3. Cells only come from pre-existing cells

8.  Section 2

15.  Best ratio is a big number

18.  Very primitive cell  Have no true nucleus  DNA is organized in a region- nucleoid  The bacteria are our prokaryotes

19.  Advanced cells  DNA in a nucleus surrounded by a membrane  Most organelles have membranes  All other cells

20.  Many organisms remain single-celled

21.  Some organisms have organized into colonies

22.  Many organisms are multi-celled

23.  Multi-celled organisms with cell group tasks:  The simplest group of performing cells - tissues  Groups of performing tissues – organs  Groups of performing organs – organ systems  Groups of performing organ systems – organisms Cells - tissues – organs – organ systems - organisms

24.  Section 3

38.  Section 4

40.  End - - Chapter 4