Virus Structure Virus Structure Viruses are not plants, animals, or bacteria, but they are the quintessential parasites of the living kingdoms. Although they may seem like living organisms because of their prodigious reproductive abilities, viruses are not living organisms in the strict sense of the word. Without a host cell, viruses cannot carry out their life-sustaining functions or reproduce. They cannot synthesize proteins, because they lack ribosomes and must use the ribosomes of their host cells to translate viral messenger RNA into viral proteins. Viruses cannot generate or store energy in the form of adenosine triphosphate (ATP), but have to derive their energy, and all other metabolic functions, from the host cell. The Geniverse Lab Copyright© Copyright The Concord Consortium Record Link <a href="stem-resources/geniverse-demo">The Concord Consortium. Geniverse Demo. Concord: The Concord Consortium, 2011, March 14.
Christmas Lectures 1977: The Planets What exists beyond Earth? Over six lectures presented in 1977, American astronomer and cosmologist Carl Sagan explores the vast expanse of space that surrounds the third planet from the Sun. Life on Earth Where at first we could only discern the size of our planet and some knowledge of its atmosphere and configuration, the evolution of planetary exploration has revealed not only intricate details of Earth’s climate and geology, but a multitude of stars and planets besides our own.
American Field Guide The American Field Guide site has been retired from pbs.org and is no longer available Produced in 2001 by Oregon Public Broadcasting, American Field Guide was an early experiment in online video for PBS. A unique local-national partnership, AFG presented a curated collection of over 1400 outdoors and recreation videos, produced by nearly 30 local stations around the country. Many of the programs and videos featured on AFG are still available through local station websites. Below is a list of participating programs and stations.
Are Viruses Alive? Created by George Rice, Montana State University "Viruses straddle the definition of life. They lie somewhere between supra molecular complexes and very simple biological entities. Science Classroom Lessons Snicker's Science Playdoh Mountains (Student worksheet provided) Ride the Rock Cycle Mighty Minerals (Student worksheets provided) Sand Hunt (Student worksheet provided) Simply Sediments (Student worksheet provided) Rock and Roll - Building Earthquake Proof Homes Plate Tectonics - Pick-A-Project (Student worksheet provided) Weather Lessons (Student worksheets provided) Don't miss ..."Digging Into Science - An exploration of paleontology" - Visit this area for details on creating a "dinosaur dig" for your students and an assortment of lesson to explore the world of dinosaurs and fossils! Visit my ISM Geology Online page for more lessons about rocks and minerals, such as GeoHunt, Sediment Sleuths, and Project Geode! Join the Middle School Earth Science E-group! Visit for more details!
A model transformer Shows the basic principle of any transformer: a change in current in the primary coil will induce an e.m.f. (voltage) in the secondary coil. For each student group NOVA How Many Dimensions Does the Universe Really Have? An engineer, a mathematician and a physicist walk into a universe. How many dimensions do they find? The engineer whips out a protractor and straightedge. That’s... Read Full Post