Download Unit 3 Cells growth and division

Unicellular organisms
Unicellular organisms also multiply by dividing themselves.
Since each unicellular organism is made up of only one cell,
a new organism is produced when a cell divides.
Bacteria and paramecia
Unicellular organisms, such as bacteria
and paramecia, multiply by dividing
themselves.
original cell
Cell division in a paramecium
new cell
Yeast
Yeast multiplies by a special method of cell division called
ed
budding. During the process of budding, a small bud grows
ows
from a yeast cell. The bud then increases in size and breaks
eaks
away from the original yeast cell.
yeast cell
new bud growing
Generate possibilities
Name three other unicellular
organisms that multiply by
div
dividing themselves.
Quick Check
What is the difference
between cell division in
human beings and cell
division in yeast?
Cell division in a yeast cell
That’s
C
L!
Cells also multiply to help our wounds heal.. Our skin cells and
iply to cover an open
blood cells are some of the cells that multiply
und healing and cells
wound. There are different stages to wound
behave differently during each stage.
Cell division is veryy important in wound healing.
A i i 3.1
Activity
Cell growth and division 33
(S)O2TB6A_03.indd 33
1/7/10 4:14:56 PM