UW-Madison BIOLOGY 151 - Endomembrane System (3 pages)

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Endomembrane System

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Endomembrane System


Endomembrane system

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University of Wisconsin, Madison
Biology 151 - Introductory Biology

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BIO151 1nd Edition Lecture 5 Outline of Last Lecture Membrane Fluidity Membrane Transport o Transport proteins o Energy Requirements Passive and Active Transport o Coupling mechanisms Outline of Current Lecture Prokaryotic Cells Eukaryotic Cells o Nucleus o Endomembrane system Traffic patterns Exocytosis endocytosis Degradation and recycling Current Lecture Active transport driven by ATP hydrolysis o Transport protein called ATPase Cotransport two or more molecules moving at once o one is moving down the concentration gradient o one is moving up links favorable to unfavorable by using a single transport protein we can physically link an energetically unfavorable rxn to an energetically favorable rxn These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Antiport system two different directions uses antiporter Symport System same molecules move in same directions Single cell 3 6 billion years ago o Structurally simple o Biochemically advanced o Prokaryotes before nucleus like Bacteria Small 1 10 micrometers Very simple membrane No internal membrane no organelle Larger more complex cells Eukaryotes true nucleus 1 5 billion yrs ago o Signature organelle nucleus o 10x bigger than Eukaryotic cell 10 100micrometers in diameter diameter increases by 10x volume increases by 100x o Internal membrane compartments organelles o As size increases so does information and energy o DNA content 10x Multiple DNA molecules package them into the nucleus o Includes lots of classes Protist Animals Plants Fungi Endomembrane System for processing and delivery of materials inside membrane all organelles work together simultaneously Cytoskeleton provide internal structural support Large organelles with additional DNA includes mitochondria all Eukaryotes have this plastids includes chloroplasts algae and plants o Plants have cell walls vacuoles and plastids o Fungi have cell walls and vacuoles o

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