Page 192 - Microsoft Word - LessonPlan-Overview.doc
P. 192
The cells with nuclei are called There are two kinds of ER. Rough
eukaryotes and the cells without ER (which is the kind shown in the
nuclei are called prokaryotes. figure above) has ribosomes
Most animal and plant cells are attached to it. Smooth ER does
eukaryotes, and most bacteria cells not have ribosomes.
are prokaryotes.
Golgi Apparatus
Other Organelles
The Golgi Apparatus is an organelle
So far, you have learned about two that is sometimes called the “post
organelles. First, you learned office” of the cell. To understand
about ribosomes, the organelles all why it’s called this, let’s think for a
cells have for making proteins. minute about what a post office
Next, you learned about nuclei, the does. Imagine that you live in
organelle some cells have for California, and you mail a birthday
deciding what proteins should be card to your friend who lives in
made. Now let’s talk about other New York. The post office gets
organelles found in some cells. your letter, separates it from all
the mail going to other places, and
then puts it in the pile with all the
Endoplasmic Reticulum other mail going to New York (or
somewhere near there.) Then it’s
Endoplasmic Reticulum (or ER for
shipped off and delivered exactly
short) is kind of like the freeway of
where it was supposed to go. The
the cell. Like a freeway taking cars
Golgi Apparatus doesn’t get
from one place in the city to
birthday cards from California. It
another, ER carries lipids and
gets proteins from the ER. Like a
proteins from one place in the cell
post office sending mail to the
to the other.
exact right place, it sends the
proteins exactly where they need
to go. Sometimes that means the
proteins go to other places in the
cell. Other times, the proteins are
sent to the cell membrane so they
can be sent out of the cell to other
parts of the body.
The endoplasmic reticulum transports lipids and
proteins around the cell.
© 2011 Supercharged Science www.ScienceLearningSpace.com
594
