Karoline Betteridge

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Once upon a time, there was a wise old owl

named Steve Salvatore, but everyone called him

Mr. Owl. Mr. Owl lived in the Great Tree on the

hill.

Let's go see what he's up to tonight.

Looks like he is asleep. Let's wake him up.

Mr. Owl! Mr. Owl, wake up!

Who is it? Who's there?

Oh it's you!
What can I do for you?How are you, Mr. Owl?

I'm doing well, thank you. I was just
having a dream about cells.
It's so fascinating!Tell us about it, Mr. Owl.

I was in the nucleus, traveling along,
just seeing all of the parts of the cell.You were in the what?

I think I have a book about it.
Hold on...

Ah, yes. Here it is.

Here is an animal cell and a plant cell. They're very similar,
but they do have some differences.

Animal cellPlant cellWhat do cells do, Mr. Owl?

Why, a cell is the basic structural and
functional unit of all organisms that
can carry on life functions.

Plant and animal cells are eukaryotic, meaning they have
membrane-bound organelles, like a nucleus, and are also bigger
than other cells. Let's look at an animal cell up close.

Animal cellPlant cell

An animal cell's boundary is it's cell
membrane. This membrane also
controls what goes in and out of the
cell. The cytoskeleton is a framework
for the cell within the cytoplasm that
serves mechanical and transport functions.
The network of membranes inside and
around a related either through direct
physical contact or by the transfer of
membranous vesicles is the endomembrane
system.

Everything is floating in a
jelly-like material called the
cytoplasm.

This is the nucleus of the cell. It is like the brain of the cell,
so it controls all of the functions of the cell. It also protects
the DNA of the cell. Let's take a closer look.

lets things in and
out of the nucleuscreates the ribosomes
and RNAthe site
of protein
synthesisDNA and the proteins that
it associates with, forms
the chrormosomes

Here are all the different parts of the nucleus. Nuclear Membrane
A highly-porous membrane that separates
the nucleus from the cytoplasm and controls
what goes in/out

Then, there is the powerhouse of the cell,
or the mitochondria. It makes ATP energy
from oxygen and sugars.

Where does the cell store all of its things,
Mr. Owl?

I was just getting to that!
Vacuoles store food, waste, and water.
Lysosomes break down the waste of the cell.
Lysosomes also aid in digestion in the cell.

How do things move around in the cell, Mr. Owl?

Well, vesicles transport materials inside the cell,
and a cell can move itself around with a flagella or cilia.
Flagella are like a tiny tail that steers the cell. Cilia are short,
hairlike projections that extend from the plasma membrane.
Proteins also move around within a cell.

You see, this is the endoplasmic reticulum, or the "ER." It is a
system of membranes that is found in a cell's cytoplasm and
that assists in the production, processing, and transport of
proteins and in the production of lipids. Ribosomes can be
found on the RER, or rough endoplasmic reticulum.