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This 3 page One Day of Notes was uploaded by Carly DeAntoneo on Wednesday October 1, 2014. The One Day of Notes belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 54 views.
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Date Created: 10/01/14
1 Endomembrane system a less confusing summary a b c d Every organelle has a membrane The purpose of a membrane is always to separate two parts It is always made of phospholipid bilayer It regulates protein traffic and metabolizes i Quick reminder metabolize basically means breaking something down using enzymes It is always continuous with the organelle it is covering and often with other organelles i E ER and Nuclear envelope Vesicles also help connect membranes with other membranes 6 parts of the endomembrane system i Nuclear envelope ii Endoplasmic reticulum iii Golgi apparatus iv Lysosomes v Vesicles and vacuoles vi Plasma membrane Nuclear envelope i Structure 1 It s a double membrane that wraps around the nucleus and separates it from the cytoplasm a The nucleus i Technically two parts to the nuclear membrane 1 The outside membrane a Lined by ribosomes 2 The inside membrane a Inside is also lined by the nuclear lamina which is a netlike structure that is made of proteins b You can remember this by realizing that the inside of any structure is called the lumen Lumen gt lamina Lamina of the nuclear envelope 3 The envelope also has points in its membrane where the two layers pinch together and form holes called quotpores think if you were to poke hole into the cup a You would call the two layers here continuous because they are touching b sn t lined by the nuclear lamina because it has its own protein structure called a pore complex 4 Also continuous with the ER ii Inside the nuclear envelope is chromatin and the nucleolus iii The chromatin flows freely around in the nuclear envelope but the nucleolus is a little ball in and of itself 1 It is a black structure that doesn t have a membrane but is its own thing Nudeus A Chromatin This segment of a chromosome ii Purpose 1 Nucleolus and Chromatin a The nucleolus is where ribosomes are made i rRNA is made ribosomal RNA 1 NOT ribosomes 2 Created from instructions from the DNA chromatin a This is why the chromatin and the nucleolus are close together ii Proteins are imported from the cytoplasm and rRNA assembles them into ribosomes iii The new ribosomes exit through the nuclear pores 1 These ribosomes either attach themselves to the nuclear envelope or the ER and become membrane bound ribosomes or float around in the cytosol and become free ribosomes 2 Nuclear Lamina a Inside lining of the internal membrane b Made of proteins c Maintains shape of nucleus 3 Nuclear Envelope a Separate nucleus from cytoplasm b Form nuclear pores i Lines by pore complex 1 This is what allows them to regulate entrance and exit of proteins and other macromolecules required to make things like ribosomes c Continuous with the ER to transport proteins and ribosomes
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