Cell wall - s3.amazonaws.com
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Transcript Cell wall - s3.amazonaws.com
How can we see cells?
Cells are two
small to be
seen with
the naked
eye so we
must use a
microscope
What is a Microscope?
A microscope is an
instrument that
makes small objects
look larger
A compound
microscope contains
more than one lens
How do Microscopes Work?
Some microscopes use
lenses to focus light onto
an object
The lenses in light
microscopes are similar to
the clear curved pieces of
glass used in eyeglasses
Section 2: What is inside a cell?
Organelles –
tiny cell
structures
that carry out
specific
functions
within the cell
What is the structure surrounding
the cell?
Cell wall - a rigid
layer of nonliving
material that
surrounds the
cells of plants and
some other
organelles
What is the cell wall made of?
Cellulose – a
tough, yet
flexible,
material
Wood contains
a lot of
cellulose
What is the function of the cell
wall?
A plant’s cell wall
helps to protect
and support the
cell
Cell walls allow
trees to stand so tall
If the cell wall is so stiff can
materials still pass through the cell
wall?
Yes, many
materials, including
water and oxygen,
can pass through
the cell wall
What is just inside the cell wall?
Cell membrane –
controls what substances
come into and out of a cell
All cells have cell
membranes
How does the cell membrane allow
things to pass through?
There are tiny
pores in the
membrane that
allow things to pass
through like a
window screen