Transcript What is the nucleolus?

Nucleolus
By: Tiffany Kim #19
MJ Lewis #20
What is the nucleolus?
The nucleolus is an organelle that is a nonmembrane bound structure composed of
proteins and nucleic acids. It resides within
a eukaryotic cell's nucleus and is
concentrated in the area of RNA
production. The nucleolus contains the
hereditary information for reproducing.
Where is it located?
The nucleolus is found
directly inside of the
nucleus, hence the name
"nucleolus". Since the
nucleus is the controlling
part of the cell, many
confuse that the nucleolus
ALSO controls the cell due
to its location. Although, that
is incorrect because the
nucleolus has its own part in
the cell process.
What does it look
like?
The nucleolus does not
have any unique or
special appearance
compared to the nucleus
or any other organelle in
the cell. It is simply just a
smaller aspect within the
nucleus. Although, a
nucleoplasm, a jelly-like
substance like the
cytoplasm, surrounds
the nucleolus.
How many are of
this organelle?
The average human body is known to have
about 1.3 trillion animal cells, leading to the
same amount of a nucleolus. But adding on
bacteria and similar cells to germs, there are
about 100,000,000,000,000 cells in an animal
and/or human. Although, in some cases (due
to certain situations), the amount of a
nucleolus can be smaller than the amount of
cells.
What does it do?
The nucleolus directs
assemblies of proteins
within the cell's
nucleus. RNA is
synthesized and
assembled within the
nucleolus. Overall, the nucleolus
produces ribosomes during
interphase, the period of the
cell cycle where the nucleus
is not undergoing division.
What would happen if it were
located some where else?
The location of the nucleolus is
very important in the cell's
cycle of processes. It creates
proteins, or ribosomes, for the
cell, which plays a big part into
the human body's system
alone. If it were located in
another place, nothing would
make the ribosomes, and in a
chain of events, affect the rest
of the cells.
What would happen if the
nucleolus wasn't there?
Every organelle of a cell has its
part in the cell cycle, therefore its
location plays a big part in it.
Since the nucleolus is located in
the nucleus, its presence alone
helps the nucleus function too. If
it were to be removed, the
nucleus would not be able to
function, therefore, it affects the
rest of the cell.
Summary of What You Know
NOW
Interphase is the
period of when the
nucleus is not going
through division.
The nucleus could not
function without the
nucleolus.
One missing organelle
BONUS FACTS
1. Prokaryotes do not have them
2. They contain chromosomes, holding DNA
3. It's impermeable to most molecules
4. It does not contain any membrane-bound subcompartments
5. It was the second organelle to be discovered
6. It has a double membrane called a nuclear
envelope that separates it from the cytoplasm
7. It was found by Franz Bauer
8. Some nuclei may contain more than one
nucleoli
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