1. Cell Structure and Function
Chapter 7
Cell Structure and Function

2. 7-4 The Diversity of Cellular Life Objectives
Describe cell specialization
Identify the organization levels in multicellular organisms.

3. 7-4 The Diversity of Cellular Life
Unicellular Organisms
Single-celled
Performs all of it’s necessary life functions.
Ciliata (up to 3 mm long) are unicellular organisms most abundant in fine sandy sediments. Their body is covered by a felt of cilia which may be modified around the mouth opening

4. 7-4 The Diversity of Cellular Life Unicellular Organisms
Diatoms are a major group of eukaryotic algae, and are one of the most common types of phytoplankton. Most diatoms are unicellular. Not only are there more than species of the cute little critters, they are found everywhere that there’s water including on and in soil.

5. 7-4 The Diversity of Cellular Life Multicellular Organisms
Cell specialization – Each specialized cell performs a specific life function.

6. 7-4 The Diversity of Cellular Life Levels of Organization
(Largest)
(Smallest)

7. 7-4 The Diversity of Cellular Life Levels of Organization
Tissues – similar cells are grouped into units.
Organs – Groups of tissues work together.
Organ System – A group of organs that work together to perform a specific function.

8. 7-4 The Diversity of Cellular Life Levels of Organization continued…
ORGAN SYSTEM
ORGAN
CELL
TISSUE

9. 7-4 The Diversity of Cellular Life Levels of Organization
What level of organization is a tongue???
Hmmm?

10. 7-4 The Diversity of Cellular Life Objectives
Describe cell specialization
Identify the organization levels in multicellular organisms.
End of 7-4