UW-Madison BIOLOGY 151 - Cells and Membranes (2 pages)

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Cells and Membranes



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Cells and Membranes

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Cells and Membranes


Lecture number:
3
Pages:
2
Type:
Lecture Note
School:
University of Wisconsin, Madison
Course:
Biology 151 - Introductory Biology

Unformatted text preview:

BIOLOGY 151 Edition Lecture 3 Outline of Last Lecture I Carbs II Lipids III Proteins Outline of Current Lecture Nucleic acids The cell theory Biological Membranes Structure o Major components 95 Phospholipids proteins Models of organization o Minor components 5 Glycoproteins and glycolipids cell identify markers Sterols fluidity buffers Current Lecture Nucleic acids made of nucleotides o Important polymers DNA and RNA Subunits monomers called nucleotides has 3 parts Phosphate group can have between 1 3 Pentose 5C Sugars ribose RNA or deoxyribose DNA Nitrogenous base 4 in RNA 4 in DNA ATP a nucleotide ribose based adenine is the nitrogenous base hydrophilic phosphate group overall hydrophilic Life as we know it starts in water aqueous based o Goes from chaos disorder to order where life can exists o Needs Physical boundary membrane information work energy Cell theory of life theory formal presentation of life as we know backed by scientific evidence o Cell is the functional unit of life All living organisms are composed of one or more cells 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 o Cells arise only from preexisting cells by dividing o Disorder isn t life order is life Physical Boundary cytoplasm within plasma membrane aka plasmalemma organelles surrounded by cytosol o Boundary that separates hydrophobic from hydrophilic o Monolayer of phospholipids vs phospholipid bilayer sealed spheres are stable form o Can be very large eukaryotic cell 10 100 m in diameter m micrometer 10 6m o Can be medium prokaryotic cell large organelle 1 m in diameter o Can be small vesicle 50 60nm in diameter 1nm 10 9m Biological Membrane o Made up of 1 phospholipid bilayer and 2 associated protein makes up 95 of membrane by mass o Two models Old model predicts protein is hydrophilic which is false predicts smooth cut Fluid Mosaic Model predicts chunks 2 classes of proteins 1



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