Lecture 2 - ORIGIN OF LIFE CHAPTER 25(parts Also see...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1/6/2012 1 1 ORIGIN OF LIFE CHAPTER 25 (parts) Also see Chapter 4 (parts) Learning Tips for Biology How to read a Chapter in the Textbook Check notes and preview slide (if any) as to the important parts of the chapter to learn. 1 st Read-through (20- 30 min) Rough outline: What are Key Concepts? What are subtopics? What are the pictures about? NO DETAILS YET. GET THE BIG PICTURE 2 nd Read-through (30 min 1 hr) Finer detail of each subtopic 3 rd Read-through (how much time do you have?) Finer detail of each subtopic
Image of page 1

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

View Full Document Right Arrow Icon
1/6/2012 2 Learning Tips for Biology How to work Carmen Quizzes (Practice Problems) Minimum retention (C grade) Don’t read the book first. Try to answer the question by looking it up in the Index Memorize the answers Maximum retention (A & B grade) Read the book first (see How to Read the Textbook) Try a question. If you don’t know it, go to the book Read everything on the subject until you are confident Goals for the Lecture on The Origin of Life -1 Chronology of Earth and Life on Earth 4 Stages in Origin of Life 3 Theories on Chemical Origin of Life on Earth Chemical Evolution RNA World Membrane Enclosure DNA World First Life-forms were Prokaryote (Bacteria & Archaea) Horizontal gene transmission and/or symbiosis lead to Eukaryotes
Image of page 2
1/6/2012 3 Goals for the Lecture on The Origin of Life -2 Understand the “Bottom Up” and “Top Down” approaches to the synthesis of life Scientists are synthesizing the cellular components that are necessary for life and trying to put them together to create life. Other scientists are removing genes from the smallest life forms to make the minimum necessary for life 6 The universe began with the Big Bang about 13.7 bya Our solar system began about 4.6 bya The Earth is 4.55 billion years old 4 bya the Earth cooled enough for outer layers to solidify and oceans to form 4-3.5 bya life emerged 2.5 bya oxygen admosphere Eukaryotes emerged about 1.5 bya. History of life on Earth Insects Homo 5 Earth Formed 4 Life Begins 3 O 2 2 Eukaryotes 1 Now
Image of page 3

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

View Full Document Right Arrow Icon
1/6/2012 4 What Were the Steps to Life? Can We Reproduce the Creation of Life? 7 8 Origin in 4 Overlapping Stages 1. Nucleotides, amino acids and sugars produced prior to the existence of cells 2. Nucleotides and amino acids became polymerized to form DNA, RNA and proteins 3. Polymers became enclosed in membranes 4. Polymers enclosed in membranes evolved cellular properties
Image of page 4
1/6/2012 5 9 Three Hypotheses as to the Origins of Organic Molecules 1. Reducing Atmosphere/Partial Reducing Atmosphere Hypothesis 2. Deep Sea Vent Hypothesis 3. Panspermia Hypothesis 10 Reducing atmosphere hypothesis Harold Urey and Stanley Mille r 2010, old vials of Miller included H 2 S produced even more amino acids .
Image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
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