World Builders™
World Builders™
Session Four   --  Links   
Session Four   --  Links   

    Life Begins on Your Planet
    Life Begins on Your Planet

Life's Time Lines   Cell Structure   Cell Division   Images   Genes and Heredity  Extremo-

Tables of the Chronology of Life on Earth

Geologic Time Scale by Dr Stephen J Wolf.  Beautifully organized.  Print this out and keep it handy!

Geologic Time Scale: neatly presented time scale: good for printout

Good comments on life form development.

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Cell Structure and Processes
Visit the Microbe Zoo at the Digital Learning Center for Microbial Biology.  Images and descriptions of microscopic organisms and the habitats in which they live. Don't miss this one! It is very user-friendly, and explains useful information in a very accessible way. Useful for teachers at all levels.

USGS site about microorganisms, what they are and how to collect them. Haven't you always wanted to collect slimy flocculates? Don't miss this one! Good graphics, simple explanations, easy navigation.

The Cell Nucleus: a pictorial guide to chromatin organization by Gwen Childs @ U of Texas Medical Branch. Excellent science program, accessible to general reader who is willing to go slowly. Vocabulary words are linked to images and definitions. Graphics are very helpful.

Cell Biology Student Handbook from MIT: Clear explanations, good information.

Cellupedia: An excellent ThinkQuest project about cells and how they are constructed.

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Cell Division

An animation of Meiosis, the way that eukaryotes divide for reproduction.

Move the chromosomes to see if you can do mitosis (asexual division) and/or meiosis (sexual division).  Try it!  It's fun!

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Microbiology and Biology Courses

The Virtual Cell Web Page: Outstanding diagrams and explanations.

California State University Biological Sciences World Wide Web Server. Excellent menu with links for all sorts of science areas helpful to world builders. Many have good entry level information and graphics.

An excellent introductory microbiology course by Dr. R. E. Hurlbert with very helpful graphics and images, and information that is accessible and useful for world builders.

The Microbe Zoo: Delightful place to learn about microbiology! Attractive, informative, and amazing! A Must See Site!
Teachers, this site is available on CD-ROM for $35.00 on line or by phone orders.

Stalking the Mysterious Microbe! An excellent easy to read user friendly site with a lot of information about microbes. It has information on bacteria, fungi, and viruses, and more!

MIT Biology HyperTextBook, includes cells, photosynthesis, genetics, and much more!

Lecture Notes for Biology 1010 Principles of Biology. Dr. Steven J. Wolf California State University Stanislaus. Excellent lecture notes.

Wayne's Word: The Five Kingdoms:  Excellent explanations of how the classification of all life forms on earth is laid out.  Easy to understand and navigate.  This is a huge site. 

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This site has links to many pages with many digital images of unicellular life forms, diatoms, algae, etc. Check these out: they are very beautiful! There are also sites with information for K-12 teachers, and a history of microscopes.

Cells Alive has beautiful photographs and movies of unicellular life forms plus lists of web sites with more microphotography. This one is one of my favorites -- a must see!

Plankton:  This page has information and pictures of  many of the tiny organisms that make up the phytoplankton.  Be sure to visit the gallery!

The Biology Department of the University of Bowling Green has many more photographic images of unicellular life forms. An excellent source of inspiration for world builders.

Library of 3D Molecular Structures: these are available as gifs, or also as three dimensional models. You will need a special viewer to see these as 3D images.
Molecules include water and ice, carbon, molecules of life such as amino acids and lipids, sugars and photosynthesis. These are beautiful, and well worth a look!

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Genes and Heredity

DNA from the Beginning: Excellent presentations with animations, audio, and problems all keyed to concepts.  Easy to understand and interesting!

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Life in Extreme Environments: An annotated listing of articles about life forms (mostly unicellular) living in very challenging environments which are hot, cold, dry, salty, etc. Excellent. Information about deep sea vent communities.

Microbiology-- The Beginning.  Extremophiles Excellent descriptions and links with information on extremophiles in many different environments.

What do Microbes Eat?  This interesting page has a lot of information.  Pay particular attention to this section if your life forms are in unusual or extreme environments, as it will tell you what they need to find in their environments and what byproducts they produce by their metabolisms.  For example, do they produce oxygen?

The Search for Extremophiles on Earth and Beyond Read Dr Penelope Boston's article about the tough little organisms that live on earth.

Extremophiles The Virtual Museum of Bacteria has a page here with information and lots of links. A good place to start thinking about this topic.

Ad Astra Magazine: Astrobiology EXPANDED EDITION January/February 1999. Interesting articles by scientists about their thoughts on the possibility of finding life forms on other worlds.

Introduction to the Archaea:  An interesting and easy to read introduction to this amazing group of life forms.

Life on Ice: The Possibility of Life on Europa and Enceladus. A short paper by Craig Levin describes the conditions necessary for the development of life. Non-technical and easy to understand. Read this one!

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Copyright © 1999, 2001, 2002.   Elizabeth Anne Viau and her licensors.  All rights reserved. This material may be used by individuals for instructional purposes but not sold. Please inform the author if you use it at