{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 26 - CR - Chapter 26 The Tree of Life An...

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

View Full Document Right Arrow Icon
1 of 14 of 14 Chapter 26: Chapter 26: The Tree of Life The Tree of Life An Introduction to Biological An Introduction to Biological Diversity Diversity
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
2 of 14 of 14 Life is a continuum Life is a continuum Extending from the earliest organisms to the great variety of species that exist today Geological events that alter environments change the course of biological evolution Conversely, life changes the planet that it inhabits Geologic history and biological history have been episodic, marked by what were, in essence, revolutions that opened many new ways of life Often referred to as “explosions” of speciation events
Image of page 2
3 of 14 of 14 Synthesis of Organic Compounds on Early Earth Early Earth Earth formed about 4.6 billion years ago along with the rest of the solar system Earth’s early atmosphere contained water vapor and “reducing” chemicals such as methane (CH 4 ), ammonia (NH 3 ), and sulfur- containing compounds Deep-sea vents and underwater volcanoes were likely candidates for having this mix of chemicals Miller-Urey experiment supported this scenario Carbon compounds have been found in some of the meteorites that have landed on Earth
Image of page 3

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

View Full Document Right Arrow Icon
4 of 14 of 14 Abiotic Synthesis Abiotic Synthesis of Polymers of Polymers Small organic molecules polymerize when they are concentrated on hot sand, clay, or rock Protobionts are aggregates of abiotically produced molecules surrounded by a membrane structure Liposomes can form when lipids or other organic molecules are added to water 20 μ m (a) Simple reproduction (b) Simple metabolism Glucose-phosphate Glucose-phosphate Phosphorylase Starch Amylase Maltose Maltose Phosphate Figure 26.4a, b
Image of page 4
5 of 14 of 14 The “RNA World” and the Dawn of The “RNA World” and the Dawn of Natural Selection Natural Selection
Image of page 5

Info icon This 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