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Class notes - BIOL 1201 1/13 Key points of Nature of Science Science originates in question about the normal worl Science uses observations and

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BIOL 1201: 1/13 Key points of Nature of Science Science originates in question about the normal worl Science uses observations and evidence to construct explanations about phenomena and testable hypothesis o The more observations and other kinds of evidence that support a hypothesis, the stronger that hypothesis Scientist employ a variety of techniques to investigate the natural world Scientist make their explanations public through presentations and publications Scientist present their explanation and critique the explanations proposed by other scientist Definition of Science The use of evidence to construct testable explanations and predictions of natural phenomena, as well as the knowledge generated through this process Body temp of 37 C 1 Atm pressure Highest temp of bacteria can reach is 132 Range of Conditions for Life Cell/Body temp from -2C to 132C Most common habitat for life on the planet: the deep ocean Accounts for 92% of biosphere with average depth of 1000 meters Range of pressures: 1Atm to 1100Atm 10 meters= 1Atm At the average depth of the ocean o 2C to 4C o 380Atm of pressure o No sunlight Antarctic Fish Live and have body temps at -2C (below the freezing points of water) They are known as ectotherms (receive body heat from environment Fish accumulate antifreeze molecules Penguins(endotherms) Keep warm at similar temps Endotherms are organisms whose temperature is regulated by their body Seals Hold their breath up to 90 minutes Dive up to 1500 meters for as long as 90 minutes Deep Sea Fishes Down to 7000 meters High pressure, cold temp, low food available Food source drifts down from the surface Barophiles Bacteria- piezophiles
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Barophiles are “pressure loving” o Thrive at pressures that kill surface bacteria Thermophiles “Heat loving” Bacteria-thermophiles exist at temps of 130C Thrive at hydrothermal vents Minerals come from vents where life thrives Sharks Live with ½ molar urea in their tissue Urea is used to denaturize proteins(potent) **********And why is this important? Halophiles “Salt loving” These bacteria live in osmotic equilibrium with 3 molar salt Ex. Red brine Tuna Raise the temperature of their muscles above ambient (as much as 15C) They are endotherms in contrast to ectotherm fish Gutless Tubeworms Thrive at deep-sea hydrothermal vents Don’t have mouth, digestive tract or anus Live on sea vents Have hemoglobin, accounts for their red color Have symbiotic bacteria within them Mid-water Fish and Invertibrates Organisms living in the water column achieve natural buoyancy despite the high density of organism Chemistry Background Elements- pure substances which can not be broken down into two or more simpler substances by methods ordinarily available in the laboratory o 92 naturally occurring elements o 103 total Atom- the smallest unit into which an element can be divided and retain its energy
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This note was uploaded on 04/27/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Class notes - BIOL 1201 1/13 Key points of Nature of Science Science originates in question about the normal worl Science uses observations and

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