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Name______________________________
Shilala
Notes Chapter 5 Cell Growth and Cell Division
5.5 Multicellular life pgs. 143 - 147
KEY CONCEPT
What does the X
represent?
Cells work together to carry out complex functions.
A. Multicellular organisms depend on interactions among
different cell types
 ________________ are groups of cells that perform a similar
function.

________________ are groups of tissues that perform a
specific or related function.

_________________ ________________ are groups of
organs that carry out similar functions.

What label should go at the X in the picture?___________________

Organ systems help an organism maintain homeostasis

Example Plants need to maintain a specific water level or they can wilt and die

Absorb water through roots and expel through Stomata in leaves
B. Specialized cells perform specific functions.

Cells develop into their mature forms through the process of _________
________________________.

Most cells contain a full set of DNA

However, a cell differentiates among the genes and only uses certain ones

Example - Making a specific meal
 DNA = a cookbook
 Different genes = different ingredients
 Different cells = different recipes

A cell’s __________________ in an embryo helps determine how it
will differentiate.

Example animal cell

Many rapid divisions after fertilization

Cells migrate to specific region

Begin to differentiate.

Resemble hollow ball
Label come cell types found at
each layer
Inner __________________
Middle_________________
Outer__________________
C. Stem cells can develop into different types of cells

Stem cells are unique type of ____________ cells. They can come from adults and
embryo’s

Stem cells have the ability to:
a) ______________ and _________________ themselves
b) Remain _________________________________ in form
c) Develop into a _____________________ of specialized cell types

Stem cells are classified into
________ types.

When stem cells divide they form 2
__________ cells or 1 stem cell and
1 ________________________ cell
1. Stem Cell Classification

Stem cells can be classified by their ability, or potential to develop into different cells and
tissues

__________________________, or growing into any other cell type

pluripotent, or growing into _________ cell type but a totipotent cell

_______________________, or growing into cells of a closely related cell family
2. Adult Stem Cells (Somatic stem cell)

Come from, _______________, liver, muscle, dental and even fat cells.

Can even come from ______________________ and umbilical cord blood.

Advantages of Adult stem cells

Grown in ___________

Can be put directly into the body with very little chance of transplant
___________________


Less _________________________ issues

May be ______________________ rather than multipotent
Disadvantages

________ in number, difficult to ____________________ and tricky to ___________ in
the lab

May contain more ___________ abnormalities
3. Embryonic stem cells

Come from donated embryo’s grown in a ________________

Result of In-vitro _______________________

Taken from _______________________ cells 3 – 5 day old embryos



Called the ______________ ____________ mass

Don’t have any ___________________ cell characteristics
Advantages of ____________________ stem cells
 ______________________

Can be grown ______________________ in culture.

Can become any of the ________ types of cells
Disadvantages

Body may ___________________ the cells

Could grow unchecked and become a ______________

Kills the _________________

Creates ___________________ issues
Do you think stem cell research should be legal or illegal? Explain what factor or factors you think
are most important to make stem cell research legal or illegal. Defend your position in a paragraph
on a separate piece of paper! Turn in for extra credit!