chapter 26 outline

chapter 26 outline - selection produced very simple cells...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 26 Life is a continuum extending from the earliest organism to the geat variety of species that exist today. Geologic events that alter environments change the course of biological evolution. Living things change the planet they inhabit. o The emergence of homo sapians has changed the land, water, and air on a scale and at a rate unprecedented for a single species. Geologic history and biological history have been episodic, marked by what were in essence revolutions that opened many news way of life. o Asteroid and emergence of humans Each organism alive today carries traces of its evolutionary history in its molecules, metabolism, and anatomy Chemical and physical processes on early Earth, aided by the emerging force of
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: selection, produced very simple cells through a sequence of four main stages: o the abiotic (nonliving) synthesis of small organic molecules i.e. amino acids and nucleotides o the joining of these small molecules (monomers) into polymers including proteins and nucleic acids o packaging of these molecules into “protobionts” droplets with membranes that maintained an internal chemistry different from that of their surroundings o origin of self-replicating molecules that eventually made inheritance possible Synthesis of Organic Compounds on Early Earth • Earth formed 4.6 billion years ago , along with rest of solar system...
View Full Document

This note was uploaded on 09/27/2008 for the course BISC 220LG taught by Professor Mcclure during the Fall '07 term at USC.

Ask a homework question - tutors are online