Download presentation
Presentation is loading. Please wait.
Published byWilfrid Robinson Modified over 9 years ago
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
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.