Biology Class Notes - Biology Class Notes I 1st law of...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology Class Notes I 1 st law of thermodynamics: energy can’t be created nor destroyed (PE & KE) 2 nd law of thermodynamics: entropy (state of disorder; must add energy to go back to order) Energy: ability to do work (ex: eating) Photosynthesis: sun + chlorophyll + CO 2 + H 2 O ATP (adenine triphosphate) H 2 O + O 2 + glucose Sun = source of all energy Chlorophyll = captures sun’s energy The only natural process by which C is fixed into living tissue Adenine tryphosphate: highest energy level; energy currency of life Glucose: C 6 H 12 O 6 Only way of recycling atmospheric carbon H 2 O + CO 2 carbohydrates Autotrophs: make own food, producers Heterotrophs: must eat other organisms, consumers Chemoautotrophs: survive without oxygen ____________________________________________________________________________________________ REMEMBER CLADOGRAM!!! When you excrete fluid, you exchange DNA “The Rivet Hypothesis” – if you keep taking rivets/species out, the plane/ecosystem will fall apart The Circle of Life Everything in life has a purpose; everything is fear-based (complacency is bad) Extinction is a natural process; every species eventually goes extinct Universe’s age: 10 billion years (by Big Bang, 6 billion ) 2.5 billion years without life 3.5 billion years ago, life started Universe has concentric rings, layers that go large to small . . . small to large = evolution Simplest doesn’t necessarily mean primitive or small, just a small number of cells Complex = advanced Prokaryotes = before the nucleus UCA (universal common ancestor) Life didn’t form on earth, it evolved on earth Meteor brought in life, water began to liquefy, oxygen became available later Earth used to have harsh environment Our immune system keeps “bugs” (bacteria, etc) in check, but otherwise we’ve evolved to coexist Histamines are always at work (to get bugs out), body maintains homeostasis Cell: anything with boundaries around it (in the case of a cell, the cell wall) Cell theory: all organisms are made up of cells Robert Hooke: looked at bark of oak tree (dead cells) Greeks plagiarized idea, took it from Egypt Aristotle: first westerner to classify organisms (plants/animals) Hooke brought in cell theory We are particles of the cosmos, not earthly beings; nucleotides are from outer space as well Basic characteristics of organisms: 1. all living organisms made up of cells 2. all living organisms produced by DNA 3. all organisms grow and develop 4. all organisms acquire energy from environment 5. all organisms sense/feel environment and respond 6. organisms have complex organization 7. all organisms evolve
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
Image of page 2
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