BSCI 330 Lecture Notes - Lecture 5: Nuclear Pore, Endoplasmic Reticulum, Nuclear Membrane
14 Sep 2016
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Bsci330 lecture 5 nuclear and chromosomal structure (ch. 4) Exam 1 will cover lectures through this thursday (9/15) Eukaryotic cells are defined by the presence of the nucleus, which contains the genetic material. The nucleus is bounded by a double membrane (2 lipid bilayers) that communicate with the cytoplasm via large nuclear pores. The dna in eukaryotic cells is in the form of chromatin, a complex with histones and other proteins. Chromatin is a dynamic structure, which can change depending on the needs of the cell. Modification of histones is an important mechanism for regulating chromatin structure, and as a result, gene expression. The most obvious internal structure of eukaryotic cells, and their defining characteristic, is the nucleus: defines eukaryote vs. prokaryotes, prokaryotes don"t have a nucleus. The nucleus contains the genetic material of dna within a double membrane structure that"s continuous with the endoplasmic reticulum: membrane is not separate from the cell.
