Types of Bonds Custom Search Bonding Links <-- Back to electronegativity MOLO - Database The Molecular Logic Database is designed to provide teachers and students with easy access to our model-based activities. The activities are derived largely, but not entirely, from projects of the Concord Consortium sponsored by the National Science Foundation (NSF). The models are primarily of interactions of atoms and molecules, or rule-based genetics. The model-based activities are presented in a variety of sizes, styles, and degrees of teacher support, but a subset of Stepping Stones (See Overview of Stepping Stones) has been built to provide entries to larger domains. All activities are accompanied by:
The Cytoskeleton Cells contain elaborate arrays of protein fibers that serve such functions as: establishing cell shape providing mechanical strength locomotion chromosome separation in mitosis and meiosisintracellular transport of organelles The cytoskeleton is made up of three kinds of protein filaments: Actin filaments (also called microfilaments) Intermediate filaments and Microtubules Actin Filaments Monomers of the protein actin polymerize to form long, thin fibers. Chemical Bonds Selected by the SciLinks program, a service of National Science Teachers Association. Copyright 2001. For an explanation of the significance of this logo go to: Because of the tendency of atoms to complete their outer energy shells with the stable number of electrons for each shell, atoms with incomplete shells have a tendency to gain electrons, lose electrons or share electrons.
chemsoc timeline - flash We would like to invite you to suggest other items for inclusion in the chemsoc timeline. All genuine suggestions will be considered and those accepted will be credited to the individual responsible! The events do not have to be chemistry related - just notable discoveries or incidences that are of interest to scientists and the general public. Please Email firstname.lastname@example.org with your suggestion, where possible please include the date the event/discovery took place and some basic details: where it took place, who was involved and maybe some other sources of information. Parts of the Cell - Cells Alive! For life all cells have basic needs. Cells have diverged in their structure and function to accommodate these survival requirements. Here are some KEY TERMS to help you think, explore and search for similarities and significant differences that have become the characteristics of eukaryote (animal, plant) and prokaryotic (bacteria) cells. Examples might be searching: eukaryote prokaryote reproduction or animal plant cell energy.
It's All About Carbon If you have questions about climate change, please e-mail them to All Things Considered or call the show at 202-898-2395. When the subject is global warming, our mood is usually "uh-oh." Which makes sense, because a warmer Earth will lead to all kinds of disruptions and expensive adjustments that we could do without. NPR and National Geographic take a year-long journey around the globe to explore how climate is shaping people and people are exploring climate. Odd Todd But there is another way to think about all of this.
Chemistry - Humor or Humour - Fun Science Sites Ok, it's acknowledged that cramming for an organic exam isn't fun, but chemists are hilarious! Here is a collection of the funniest and strangest chemistry websites. There are sites that are just 'fun' too. DNA-RNA-Protein DNA carries the genetic information of a cell and consists of thousands of genes. Each gene serves as a recipe on how to build a protein molecule. Proteins perform important tasks for the cell functions or serve as building blocks. Membranes Organize Cellular Complexity Membranes organize proteins and other molecules enabling the cell to run much more efficiently than if everything were floating freely. Mitochondrial membranes, for example, keep protein assembly lines together for efficient energy production. And the lysosome safely holds enzymes that would destroy essential proteins if released into the cytoplasm. Membrane-enclosed vesicles form packages for cargo so that they may quickly and efficiently reach their destinations. In this way, membranes divide the cell into specialized compartments, each carrying out a specific function inside the cell. Real life complexity inside an insulin-producing pancreas cell.