1 / 14

. The Cell: Nucleus, Ribosomes

. The Cell: Nucleus, Ribosomes. Nucleus. Function contains eukaryotic cell’s genetic library most genes in nucleus some genes located in mitochondria & chloroplasts Size ~ 5 microns (µm) in diameter. Nucleus structure. Structure

gordy
Download Presentation

. The Cell: Nucleus, Ribosomes

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 Cell: Nucleus, Ribosomes

  2. Nucleus • Function • contains eukaryotic cell’s genetic library • most genes in nucleus • some genes located in mitochondria & chloroplasts • Size • ~ 5 microns (µm) in diameter

  3. Nucleus structure • Structure • separated from cytoplasm by a double membrane, nuclear envelope • double membrane is fused in spots forming pores • allows large macromolecules & particles to pass through What kind of moleculesneed to pass through?

  4. Nucleus structure • Within nucleus, DNA organized into fibrous material, chromatin • in normal cell appears as diffuse mass • When cell prepares to divide, chromatin fibers coil up as separate structures,chromosomes

  5. Nucleus structure • Densely stained region =nucleolus • Function • production of ribosomal subunits from rRNA & proteins • pass through nuclear pores to cytoplasm & combine to form ribosomes

  6. Ribosomes • Function • protein production • Structure • ribosomes contain rRNA & protein • composed of 2 subunits that combine to carry out protein synthesis

  7. Types of Ribosomes • Freeribosomes • suspended in cytosol • synthesize proteins that function within cytosol • Bound ribosomes • attached to outside of endoplasmic reticulum • synthesize proteins for export or for membranes

  8. Ribosomes • Prokaryotes & eukaryotes have different ribosomes • different size subunits • different proteins • can this difference be useful?

  9. Prokaryote vs. eukaryote ribosomes

  10. Any Questions??

More Related