Lecture 7 - BIOL104 Principles of Biology September 8, 2010...

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BIOL104 Principles of Biology September 8, 2010 Lecture #7 Ch 4:Cell Structure
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All cells exhibit basic structural similarities • Centrally located genetic material – Prokaryotes – Eukaryotes • Cytoplasm – Semifluid matrix • Plasma membrane – Encloses cell & separates cell contents from the surrounding environment
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Prokaryotic cells Simple organization Lack membrane bound organelles Stiff cell wall
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Types of cells • Prokaryotes – Bacteria • Peptidoglycan in cell wall – Archaea • Still a mystery • No peptidoglycan • Different membrane lipids • Eukaryotes
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Animal cell
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Plant cell
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The nucleus
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The Nuclear Envelope Inside the nucleus – DNA is decoded – RNA messages are produced – Ribosomes are synthesized Envelope – Fibrous nuclear lamina – Inner membrane – Outer membrane – Lumen is continuous with the RER
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Nuclear Pores Necessary to move molecules in & out of nucleus Exported to cytoplasm – mRNA – Ribosomes Imported to nucleus – Nucleotide triphosphates – Transcription factors
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Ribosome
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Kinds of RNA • rRNA • mRNA • tRNA
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Endoplasmic reticulum Continuous with the outer envelope of the nucleus Rough - Ribosomes (RER) Smooth -No ribosomes (SER) RER + SER + Golgi = endomembrane system
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Smooth endoplasmic reticulum
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 7 - BIOL104 Principles of Biology September 8, 2010...

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