Name of Cell Structure:

• Nucleus

Components of Cell Structure: 

• nucleolus
• nuclear envelope
• chromatin
• chromosomes

Specific functions of the structure within the cell:

• Nucleolus- the storage area of ribosomes and the synthesis of ribosomes. Replication and storage of DNA and RNA.
• Nuclear envelope- encloses the nucleus and separates its contents from the cytoplasm.
• Chromatin-controls DNA replication, transcription, repair and recombination
• Chromosomes- organizes DNA and protein in the cell

Role of structure wihtin the cell from a physiological standpoint:

• The nucleus holds the DNA and RNA and helps to split the chromosomes
• The chromatin bond together forming chromosomes that match together forming the DNA of each human

Do these structures exist in all cells:

• Prokaryotes don't have a nucleus and eukaryotes have a nucleus.
• Both plant and animal cells have a nucleus.

How do the specific functions of the cell structure/organelle occur:

• The nucleus is the brain of the cell that contains all the hereditary for cell growth and reproduction.

Uniques features of the nucleus:

•   The nucleolus has no membrane and is considered an organelle.
•   The nucleolus is highly dynamic.
•   The nucleolus can be seen through an electron miscroscope as a mass of densely stained granules and fibers that are joining as part of the chromatin.
•   The nuclear envelope has a double membrane.
•   The nuclear envelope has pores on the it that form a selective barrier against large molecules.

Frequency Asked Questions:

1. What exactly is chromatin? I now know that it makes up chromosomes, but how do you identify chromatin? Chromatin controls DNA replication, transcription, repair and recombination.

2. What is the function of the pores on the nuclear envelope? To form a selective barrier against large molecules.

3. What does the cell nucleus do? It holds the DNA and RNA.

4. How do they cromatin make up the chromosomes? They bond together.

5. How do the chromatin get out of the nuclear envelope? During Mitosis, the nuclear envelope disfipates and the chromatin turns into chromosomes.

6. So, essentially, is the nucleolus the brain of the nucleus? Yes.

7. The nucleolus is highly dynamic in what way? Higly Dynamic means that the shape is always changing.

8. What would happen if our cells didn't have nucleus? There would be nothing to genetically code us. So there would be no DNA or RNA.

9. What is the function of the pores on the nuclear envelope? To form a selective barrier against large molecules.

10. What do the nuclear pores do? They allow certain things in and out of the cell.

11. How does the nucleus split the chromosomes?..like, what is the process? The nucleus does not split the chromosomes. It happens during mitosis and the chromatin are condensed into the chromosomes.

12. Why doesn't the nucleus have a membrane? It does. Its called the nuclear membrane.

13. How does the nucleus replicate DNA and RNA? It replicates through mitosis.

14. What do the nuclear pores do? They form a selective barrier against large molecules.

15. What exactly is a double membrane? The lipid bilayer membrane around the cell.

16. What classifies the nucleolus as an organelle? It is an organelle because it has a specific function.

17. What would happen if the nucleus was not enclosed in the nuclear envelope? It would be exposed to the organells in the cell.

18. What would happen if the nucleus came in contact with the cytoplasm outside the nuclear envelope? There would be nothing to hold the DNA.

Bibliography:

1. Campbell, N. (2008). BIOLOGY: A P* Edition. New Jersey: Pearson Education.

2.Cell Nucleus. (n.d.). Retrieved August 16, 2008, from www.youtube.com.

3.The Cell Nucleus. (n.d.). Retrieved August 16, 2008, from www.cartage.org.lb/.../Nucleus/cellnucleus.jpg.

4. cell. ( document.write(new Date().getFullYear()); 2008). In Encyclopædia Britannica. Retrieved document.write(mm[new Date().getMonth()][1]);   September  document.write(new Date().getDate()); 18,  document.write(new Date().getFullYear()); 2008, from Encyclopædia Britannica Online School Edition: http://www.school.eb.com/eb/article-37403