Science

1. I. Cell Diversity

2. A. Cells come in different
shapes and sizes and have
different internal organization
1. Size: limited by ratio between outer surface
area and volume
*The larger the cell, the longer it
takes for nutrients to get inside
*Best size: large surface area
and small volume

3. 2. Shape: related to the FUNCTION!
Nerve Cell
Skin Cell
Fat Cells

4. 3. Internal Organization:
Prokaryotes vs. Eukaryotes
a. Prokaryotes: (first cells) no membrane
bound nucleus
b. Eukaryotes: (new cells) membrane
bound structures

7. Plant vs. Animal Cells
a. Plant cells: cell wall, plastids, large vacuoles
b. Animal cells: no cell wall, no plastids,
small or no vacuoles

8.  CELLS alive! Cell Models

9. Viruses
a. Viruses are not cells!
b. Consist of only a protein coat and DNA or RNA
c. Viruses can not replicate on their own, they
must invade a host cell in order to reproduce

10. About.com:
http://faculty.ccbcmd.edu/co
urses/bio141/lecguide/unit3/v
iruses/adlyt.html