AP Bio 1 - Its Origin and Evolution ORGANIZATION OF LIFE ON...

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Click to edit Master subtitle style 10/5/09 Organization of Life on earth Its Origin and Evolution
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10/5/09 Levels of Organization Biosphere l Ecosystems l Communities l Populations l Organisms l Organs and Organ Systems l Tissues l Cells l Organelles l Molecules
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10/5/09 Levels of Organization
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10/5/09 Biosphere Everywhere within the Earth’s atmosphere where life exists.
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10/5/09 Ecosystems The biotic and abiotic factors within an environment Interactions between organisms Interactions between organisms and the environment Cycling of Nutrients Energy flow
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10/5/09
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10/5/09 Community All living organisms in a particular region
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10/5/09 Population All individuals of a species in a particular area
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10/5/09 Organism A single living thing
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10/5/09 Organ Specialized body parts made of tissues Tissues work together to perform a specific function l Organ System Groups of organs that work together to perform specific functions
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10/5/09 Tissue A group of similar cells
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10/5/09 Cell l Basic unit of: Life Structure and function l Contains DNA
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10/5/09 Organelle Structural component of a cell
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10/5/09 Molecule Chemical structure consisting of atoms
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10/5/09 Diversity of Life Domain Bacteria Prokaryotic l Domain Archaea Prokaryotic Live under extreme conditions l Domain Eukarya Protists (unicellular eukaryotes) Kingdom Plantae (photosynthetic) Kingdom Fungi (decomposers) Kingdom Animalia (ingest others)
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10/5/09 Evolution On the Origin of Species, Charles Darwin Contemporary species arose from a succession of ancestors “descent with modification” Natural Selection Mechanism for descent with modification
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10/5/09 Early Earth & the Origin of Chemical and physical processes on early Earth may have produced very simple cells through a sequence of stages: 1. Abiotic synthesis of small organic molecules 2. Joining of these small molecules into polymers 3. Packaging of molecules into “protobionts” 4. Origin of self-replicating molecules
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10/5/09 l Earth formed about 4.6 billion years ago l Earth’s early atmosphere contained water vapor and chemicals released by volcanic eruptions l Experiments simulating an early Earth atmosphere produced organic molecules from inorganic precursors, but such an atmosphere on early Earth
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Click to edit Master subtitle style 10/5/09 Water vapor C H 4 N H 3 2 Electrod e Conden ser Col d wat er Cooled water containing organic molecules Sample for chemical analysis H 2 O Miller & Urey
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10/5/09 Other Explanations synthesis near submerged volcanoes and deep-sea vents
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10/5/09 Other Explanations Extraterrestrial Sources Carbon compounds have been found in some meteorites that landed on Earth
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10/5/09 Abiotic Synthesis of Small organic molecules polymerize when they are concentrated on hot sand, clay, or rock l Protobionts aggregates of abiotically produced molecules surrounded by a membrane or membrane-like structure could have formed spontaneously from abiotically
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This note was uploaded on 02/28/2009 for the course BIOLOGY Bio 101 taught by Professor Lancer during the Spring '09 term at Riverside Community College.

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AP Bio 1 - Its Origin and Evolution ORGANIZATION OF LIFE ON...

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