bio study notes - -Why has the Brown Pelicans proximity to...

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-Why has the Brown Pelican’s proximity to humans posed a problem for pelicans? Human development – reduced land and vegetation, killed pelicans b/c seen as competition rather than trash collectors, hunted for feathers thus many pelicans have disappeared. Pesticides – killed many pelicans, and many motor boats, etc -Biology = scientific study of life -Hierarchal organization of levels – position in hierarchy and relation to size and abundance The number of reps goes up as you move towards the top of the hierarchy (BIOSPHERE) -Biosphere – All environments on Earth that support life (thin layer of life that surrounds Earth) -Ecosystem – All organisms in a particular area, as well as nonliving -Abiotic components – nonliving -Biotic components – living -Community – entire array of organisms inhabiting an ecosystem (all the species populations in an ecosystem) -Populations – A group of individuals of a species (interacting group of individuals of one species) -Organism – individual living thing/entity -Organ systems – group of Organs that perform for one system like the nervous system, circulatory system, digestive system, etc -Organs – group of tissues like brain, spinal cord, etc -Tissues – group of Cells -Cells – Unit of living matter separated by membrane -Organelles – structure that performs specific function in a cell -Molecules and Atoms – smallest particles -How does energy flow? Sun – producers (capture sunlight energy and convert it to carbs) – consumers – heat -Cycling of chemical nutrients Air soil – plants (producers) – animals (consumers) – decomposers – back to air soil (atmosphere) -Decomposers – recyclers, they turn matter into simple mineral nutrients that plants can use -Emergent properties – properties of life
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-Prokaryotic Cells DNA not contained w/in nucleus Simpler Submicroscopic (tiny) No organielles -Eukaryotic Cells DNA contained w/in Nucleus Microscopic (larger than prokaryotes) May be unicellular (Protozoans), colonial (algae), multicellular (humans) Subdivided by internal membranes (Organelles) -What are the unifying features shared by all life? DNA is found in all living things (the coding features of DNA is translated into the proteins of life) DNA is “blueprint” of life b/c it carries the instructions on how to build the organism. The “instructions” are held in the different combinations of sequences of four Nucleic Acids (each carrying one of 4 different Nitrogenous bases: A, T, C, or G) The different combinations of these building blocks carry the code to build another organism Ordered structures Regulation of internal conditions (thermoregulation) Growth and development Energy Use Response to environmental stimuli Ability to reproduce and evolve -What are the three domains of Life? Prokaryotic domains – Archaea and Bacteria
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This note was uploaded on 10/30/2008 for the course BIO G 109 taught by Professor Winkler,d. during the Fall '06 term at Cornell University (Engineering School).

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bio study notes - -Why has the Brown Pelicans proximity to...

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