Download The Cell Unit

The Cell Unit
What is a cell?
• The basic building block of life.
• The smallest unit of life that can carry out
the life processes.
Robert Hooke
• He observed a piece of cork under a
microscope. Where does cork come from?
• The cork boxes he saw reminded him of the
rooms where the monks stayed or prison cells.
• 1st to give us the name CELL.
The Cell Theory
• 3 Scientists contributed to the Cell Theory:
• In 1838, a botanist named Matthias
Schleiden, concluded that plants are
made of cells.
• In 1839, a zoologist named Theodor
Schwann, concluded that all animal
tissue is made of cells.
• In 1858, a doctor named Rudolf Virchow,
stated that cells could only come from
other cells.
The Cell Theory
• All living things are made of one or more cells.
• Cells are the basic unit of living things.
• Cells can only come from other cells.
Schleiden
Schwann
Virchow
Recall: Spontaneous Generation
• A theory that states that living things come
from nonliving things.
Redi’s Experiment
Biogenesis
• Living things can only
come from other living
things.
How do cells vary?
•
•
•
Size
Shape
Arrangement
–
Unicellular
–
Multicellular
• Type of cell
– Prokaryote
– Eukaryote