1 / 15

“The Nucleus: Not Just a Sack of Chromosomes”

“The Nucleus: Not Just a Sack of Chromosomes”. Eunnie, Stephen, Shane and Meagan. Electron Micrograph. Image from answers.com. Artist’s Rendition or “Nucleus Cartooneus”. Image from McGraw-Hill. Eunnie’s Nucleus Comparison. What is the Nucleus?. From the latin word for “kernel” or “nut”

tamasine-mitsuyama
Download Presentation

“The Nucleus: Not Just a Sack of Chromosomes”

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. “The Nucleus: Not Just a Sack of Chromosomes” Eunnie, Stephen, Shane and Meagan

  2. Electron Micrograph Image from answers.com

  3. Artist’s Rendition or “Nucleus Cartooneus” Image from McGraw-Hill

  4. Eunnie’s Nucleus Comparison

  5. What is the Nucleus? • From the latin word for “kernel” or “nut” • Control centre of the cell • Contains most of the cell’s genetic material • It’s function is to maintain the integrity of these genes and to control the activities of the cell • Found only in eukaryotic cells

  6. Structure • Typically located in the centre of the cell • Most eukaryotic cells possess one nucleus, although the cells of fungi and some other groups may have several nuclei.

  7. Nuclear Membrane • Surrounded by a double membrane, similar to that of the cell, known as nuclear membrane • Nuclear pores allow movement of molecules such as mRNA across the membrane • Nuclear pores are filled with proteins that act as gatekeepers.

  8. Nucleoplasm • The nucleoplasm or nuclear sap, a liquid filled with genetic material known as chromatin • Chromatin contain the cell’s genetic material, DNA, as well as protein • When the cell is dividing, chromatin coils into chromosomes which appear shorter and fatter.

  9. Nucleolus • Produces and assembles ribosomes • There can be more than one nucleolus in one nucleus • The nucleolus is a knot of chromatin

  10. Diseases • Chromosomal abnormalities occur when there is an error in cell division following meiosis or mitosis • Down Syndrome (Trisomy 21) • When an individual has three copies of chromosome 21 • Turner Syndrome • When an individual is born with only one sex chromosome, an X • Cancers, Cystic Fibrosis

  11. Ribosomes Image from answers.com

  12. Ribosomes • Serve as the site of protein synthesis • Assembles proteins by the process of translation • Two types of ribosomes: • Free ribosomes, move around freely in the cytoplasm • Membrane-bound ribosomes, bound to the endoplasmic reticulum • Among the most complex molecular assemblies found in cells

  13. Diseases • Alzheimer’s Disease • Decreased activity of ribosomal genes • Associated with psychosis and depression

  14. References • Biology seventh edition, McGraw-Hill • Wikipedia • Bio 11 textbook

More Related