{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Eukaryotic Structures - Eukaryotic Structures nucleus...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Eukaryotic Structures nucleus - largest organelle in a eukaryote 1st descried by Robert Brown in 1831 surrounded by cytoplasmic filaments in some cells some cells have multiple nuclei erythrocytes - mammalian red blood cells; lose nuclei as they mature nucleolus - dark region where synthesis of ribosomal RNA takes place nuclear envelope - 2 phospholipid bilayers surrounding the nucleus outer membrane continuous w/ the endoplasmic reticulum nuclear pores - shallow depressions scattered over the surface; contain proteins that determine what substances can enter or leave the nucleus 2 types of molecules allowed to pass through nuclear envelope: o proteins moving into the nucleus for nuclear structures, catalyze reactions o RNA, protein-RNA complexes made in the nucleus chromosomes - extended into strands called chromatin except when the cell divides histones - packaging proteins which DNA wraps around nucleosomes - clusters of histones more extended form allows RNA copies to be made from the DNA condenses into tight rods when the cell divides endomembrane system - divides the cell into compartments endoplasmic reticulum - largest internal membrane; made of lipid bilayer embedded w/ proteins o cisternal space - inner region of ER o cytosol - exterior region of ER o rough endoplasmic reticulum - surface studded w/ ribosomes; used for protein synthesis o proteins made here eventually sent out from the cell o signal sequences - special amino acid sequences found on proteins about to be exported o
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern