cell file - CELL BIOLOGY-LECTURE 20:15:00 ← • Cells...

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Unformatted text preview: CELL BIOLOGY-LECTURE 06/12/2006 20:15:00 ← August 30, 2006 • Cells: Most basic unit of life o Small membrane enclosed unit filled with aqueous solution and chemicals wih the property of being able to copy itself o Every living organism comes from a founder cell • Cell Theory: o 18 th century Schleident+Schwann all living things are composed of cells and the cell is the fundamental unit of life 3 coralaries to the cell theory cells will be fundamentally similair in chemical composition all cells store and process information in the same way all cells use DNA to store information info goes from DNA RNA Protein cells have the ability to replicate themselves all cells arise from preexisting cells o How we visualize cells Originally visullized by HOoke in 1665 5 TYPES OF MICROSCOPES light allow magnification of image up to 1000x light passes through confocal similair to light microscope except it allows 3- D to be viewed fluorescent similait to light microscope except it collects fluorescent images transmission electron use a beam of electrons to gather images in 2D. very small objects can be visualized as small as 2nm scanning electron utilizes electrons to visualize images, similair to confocal (3D) Variety in CELLS Cells vary in shape and size • Avg. size .5um + 30mm in size • Cells can be bigger o Ex frog egg Cells vary in their chemical requirements • Require different diets Cells vary in function • General (egg cell) or specific (nerve cell) o Prokaryotes (single celled bacteria) vs. Eukaryotes (larger and more complex) Prokaryotes- lack membrane bound nucleus Simple cells Bacteria and archea • Yogurt lactobacillus • Anthrax bacillus anthracius Eukaryotes- membrane bound nucleus Complex cells o 3 shapes of Prokaryotic cells cocci- spherical circular cells bacilli- cylindrical rod like cells spirochytes- spiral cells archea- found in unusual environments ← Sept. 1, 2006 • Eukaryotes contain membrane bound organelles • Nucleus o The storage site of information, all of the DNA found in the nucleus o Nuclear envelope 2 concentric membranes which surrounding the nucleus o nucleolus dense region which serves as the site of ribosome production and RNA production • Mitochondria “Powerhouse of the Cell” o Responsible for energy production through the process of cellular respiration o Primarily found in animal cells, occasionally in plants o 2 membranes defining the border of the mitochondria o have their own DNA. Can perform transcription and translation, can have their own DNA....
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This note was uploaded on 04/17/2008 for the course BIO 101 taught by Professor Schau during the Spring '08 term at North Park University.

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cell file - CELL BIOLOGY-LECTURE 20:15:00 ← • Cells...

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