This document discusses the diversity of cellular life, including unicellular organisms made of a single cell, multicellular organisms made of multiple cells, and cell specialization where cells develop different functions. It provides examples of specialized animal cells like red blood cells, white blood cells, and muscle cells. The document also mentions specialized plant cells like guard cells.

1. Unit 3: Cells
Chapter 7: Cell
Structure & Function
7-4: The Diversity of
Cellular Life
Ms. Petrucci
Biology

2. Unicellular Organisms
• A unicellular organism, also known as a single-
celled organism, is an organism that consists of
only one cell, unlike a multicellular organism
that consists of multiple cells.

4. Multicellular Organisms
• Multicellular organisms are
organisms that consist of
more than one cell, in
contrast to single-celled
organisms.

6. Cell Specialization
http://www.youtube.com/watch?v=moPJkCbKjBs
Cells throughout an
organism can develop in
different ways to perform
different tasks.
All cells carry the same
DNA information but they
do not perform the same
functions and may not look
the same.
The process of a cell
becoming a particular type
of cell is called cell
differentiation.

8. Specialized Animal Cells
• All cells carry the same
DNA information but
they do not perform the
same functions and may
not look the same.
• The process of a cell
becoming a particular
type of cell is called cell
differentiation.

9. Animal Cell Specialization
• Red Blood Cells
• White Blood Cells
• Pancreatic Cells
• Nerve Cells
• Muscle Cells
• Sperm Cells (gamete)
• Ovum Cell (gamete)

10. Specialized Plant Cells
• Guard cells

11. Levels of Organization