1 - Reviewing Cell Structure and Organelles Chapter 1 Key...

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Reviewing Cell Structure and Organelles
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Chapter 1 – Key Concepts Cells are the fundamental unit of life. All cells grow and convert energy from one form to another. All cells contain DNA and use it to guide protein synthesis. Cells in multicellular organisms use their genetic information to direct their biochemical activities according to cues from environment. Bacteria (prokaryotes) are the simplest present-day cells – lack nucleus and organelles. Eukaryotic cells evolved from prokaryotes. Nucleus is most prominent organelle in Eukaryotes. Eukaryotic cells contain a variety of internal membrane-bound organelles with specialized chemistry. Excluding the organelles, the remaining intracellular component is the cytosol. The cytoskeleton extends throughout cytosol of eukaryotic cells. Biologists have chosen a select few organisms as model organisms.
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A bacterium (A), a butterfly (B), a rose (C) and a dolphin (D) are all made of cells that are fundamentally similar in chemistry and operate according to the same principles.
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Cell Theory Many textbooks provide 6 postulates of the Cell Theory that can be summarized into the three below: Cells are smallest structural and functional unit capable of carrying out life processes All organisms are composed of cells All new cells arise from pre-existing cells.
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01_02_DNA to RNA.jpg Central Dogma of Biology
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01_29_eucaryotes origin.jpg
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Members of all three domains share characteristics: Conduct glycolysis (similar chemistry) Replicate DNA semiconservatively Central Dogma
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This note was uploaded on 04/13/2008 for the course BIOL 308 taught by Professor Ragsdale during the Fall '07 term at Winona.

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1 - Reviewing Cell Structure and Organelles Chapter 1 Key...

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