Bio Lecture 5 Notes

Bio Lecture 5 Notes - Lecture 5: Tour of the Cell IV...

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Lecture 5: Tour of the Cell IV Nucleus, ER, golgi, lysosome Monday 10/5/09 Bio 93, Fall 2009 Reading: Ch. 6, pgs 102-108 Dr. Marcelo Wood
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Relationship between organelles of the endomembrane
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Nucleus contains most of the genes in eukaryotic cells Chromatin: DNA and associated proteins Synthesis of mRNA Nucleolus Synthesis of rRNA Formation of ribosomal subunits
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Nucleus is enclosed by double membrane Nuclear pores composed of nucleoporins Mediate transport in and out of nucleus
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Ribosomes: synthesize proteins Composed of rRNA combined with cytosolic proteins 2 subunits, large and small Free ribosomes -synthesize cystolic proteins Bound ribosomes (to ER or nuclear envelope) -synthesize integral membrane proteins and secreted proteins
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Endoplasmic reticulum Continuous with nuclear envelope Membranous tubules Cisternae: internal space Smooth ER -ribosome free Rough ER
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Smooth ER: rich in metabolic enzymes Large proportion in specialized cells
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Bio Lecture 5 Notes - Lecture 5: Tour of the Cell IV...

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