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The Nucleus

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on 23 October 2013

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Transcript of The Nucleus

The Nucleus
Fun Facts

The nucleus is the largest cellular organelle in animals
The nucleus was the first of the cell organelles to be discovered by scientists
Each human cell contains around 6 feet of DNA which is tightly packed, but very organized with proteins and has 26 chromosomes
Some scientists think that the nucleolus plays an important role in cell aging.
Sources Cited
http://www.kscience.co.uk/as/module1/nucleus.htm
http://www.buzzle.com/articles/cell-nucleus-structure-and-functions.html
http://micro.magnet.fsu.edu/cells/nucleus/nucleus.html
http://www.buzzle.com/articles/cell-nucleus-facts.html
http://www.encyclopedia.com/topic/nucleus.aspx
http://www.ducksters.com/science/biology/cell_nucleus.php
http://www.brighthub.com/science/genetics/articles/23805.aspx
http://www.science-of-aging.com/timelines/leeuwenhoek-sees-the-cell-nucleus.php
By: Chloe Hubbard
&
Christine Jones
Structure/Size:
nuclear pores- provide channels
nucleoplasm-liquid inside the nucleus
nucleolus- where ribosomes are made
-actual size varies from one organism to another
Commanding the Cell
The cell nucleus acts like the brain of the cell
It helps control eating, movement, and reproduction
Basically, if it happens in a cell, chances are the nucleus knows about it
The nucleus will not always be in the center of the cell
It will be a big dark spot somewhere in the middle of all the cytoplasm
Life Before a Nucleus
Not all cells have a nucleus
Biology breaks cell types into eukaryotic (those w/ a defined nucleus) and prokaryotic (those w/ no defined nucleus
You don't need a nucleus to have DNA
If you don't have a defined nucleus, your DNA is probably floating around the cell in a region called the nucleoid
A defined nucleus that holds the genetic code is an advanced feature in a cell
nuclear envelope/nuclear membrane
chromatin/chromosomes- DNA
Function:
aka Control Center
Storage of proteins & RNA
Exchange of hereditary molecules
Production of ribosomes
Storage of hereditary material (DNA)
Regulates all cell activity
It does this by controlling the enzymes present
The chromatin is composed of DNA
DNA contains the information for the production of the proteins
This info is encoded in the 4 DNA bases: Adenine, thymine, cytocine, and guanine
The specific sequence of these bases tells the cell what order to put amino cells
There are 3 processes that enable the cell to make RNA working copies of its DNA
Replication allows the nucleus to make exact copies of its DNA
Transcription allows the cell to make RNA working copies of its DNA
In translation the messenger RNA is used to line up amino acids into a protein molecule
Anton Van Leewenhoek
Robert Brown

-inside eukaryotic cells
-usually in the middle of the cell, sometimes towards the border (plant cells)
Location:
Full transcript