Lecture 2 - 1/6/2012 ORIGIN OF LIFE CHAPTER 25 (parts) Also...

Info iconThis 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
Background image of page 1

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

View Full DocumentRight 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
Background 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
Background image of page 3

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

View Full DocumentRight 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
Background image of page 4
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 . 1.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/06/2012 for the course ECON 200 Bones taught by Professor Dr.elwonger during the Winter '12 term at Ohio State.

Page1 / 21

Lecture 2 - 1/6/2012 ORIGIN OF LIFE CHAPTER 25 (parts) Also...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online