{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Class notes - BIOL 1201 1/13 Key points of Nature of...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern