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Major recent advance in prokaryotic cell biology has

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Major recent advance in prokaryotic cell biology has been discovery of the prokaryotic cytoskeleton. Up until recently, thought to be a feature only of eukaryotic cells . Image: Prokaryotic Cell : M. Ruiz From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Separates the cell from its environment. Phospholipid molecules oriented so that __________ water-loving heads directed outward and __________ water-hating tails directed inward. Proteins embedded in two layers of phospholipids (lipid bilayer). Membrane is semi-permeable . Q: What does that mean? Prokaryotes - Plasma Membrane Image: Cell Membrane diagram, Dhatfield From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Prokaryotes – Plasma Membrane as a Barrier _________ Is the diffusion of water across a semi-permeable membrane. Environment surrounding cells may contain amounts of dissolved substances (solutes) that are… - equal to - less than - greater than …those found within the cell. Images: Osmosis animation ; Osmosis with RBCs , M. Ruiz CELL Plasma membrane Liquid environment outside the cell. Liquid environment inside the cell. From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Prokaryotes – Plasma Membrane as a Barrier Tonicity and Osmosis __________: equal concentration of a solute inside and outside of cell. __________: a higher concentration of solute. __________: a lower concentration of solute. Images: Osmosis animation ; Osmosis with RBCs , M. Ruiz Water will always move toward a hypertonic environment!! From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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_________ Transport How most molecules move across the plasma membrane. Analogous to a pump moving water uphill. Types of active transport are classified by type of energy used to drive molecules across membranes. Image: Sodium-potassium pump , M. Ruiz ATP Driven Active Transport Energy from adenosine triphosphate ( ATP ) drives substances across the plasma membrane with the aid of carrier molecules. From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Peptidoglycan is a huge polymer of interlocking chains of identical peptidoglycan monomers. Provides rigid support while freely permeable to solutes. Backbone of peptidoglycan molecule composed of two derivatives of glucose: • N-acetylglucosamine (NAG) • N-acetlymuramic acid (NAM) NAG / NAM strands are connected by inter- peptide bridges. Prokaryotes – Cell Wall Image: Bonding structure peptidoglycan , Mouagip ; Other image Source unknown From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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From the peptidoglycan inwards all bacteria are very similar. Going further out, the bacterial world divides into two major classes These are: Gram ___________ Gram ___________ Prokaryotes - Cell Wall Images: Staph, Gram Stain, SPO Microbiology images, T. Port; E coli , Y tambe Learn more about the Gram+ bacterial cell wall . Learn more about the Gram- bacterial cell wall . From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Prokaryotes - Cell Wall Gram-Positive & Gram-Negative Images: Sources Unknown From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Q: Why are these differences in cell wall structure so important?
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