DNA- The ins and outs! Watson and Crick's Paper Watson and Crick published a paper that described the complementary structure of DNA. This paper rocked the science world and illuminated the structure of DNA! Check out their Paper below! Watson and Crick published a paper that described the complementary structure of DNA. Watson and Crick's Paper The Complementary Structure of DNA-The paper The Complementary Structure of DNA-The paper [ DNA Replication-Explanation and Video DNA Replication-Explanation and Video Chapter 16 Outline Below is an outline of Chapter 16. Chapter 16 Outline Below is an outline of Chapter 16. Chapter 16 Outline The Cell Craft Challenge Install and Play CellCraft until you complete the 5th level. Download Cell Craft from here As you play the game, keep track of your success by filling out the cell craft worksheet (attached below). Install and Play CellCraft until you complete the 5th level. Worksheets
Free Resources Close If you are trying to view the videos from inside a school or university, your IT admin may need to enable streaming on your network. Please see the Internet Filtering section of our Technical Requirements page. DVDs AND OTHER COPIES Videos on this page are not available on DVD at this time due to licensing restrictions on the footage. Subscribers to NBC Learn may download videos and play them back without an internet connection. Still have questions? The Science of the Olympic Winter Games videos are only available to visitors inside the United States due to licensing restrictions on the Olympics footage used in the videos. The Science of the Olympic Winter Games is not available on DVD at this time due to licensing restrictions on on Olympic footage.
Google PopG Genetic Simulation Program version 4.01 October, 2013 This is a one-locus, two-allele genetic simulation program for use by students. It simulates multiple populations and allows you to see the effect of natural selection, mutation, migration, and genetic drift. It is freely downloadable. It is written in Java, and will run on Windows, Mac OS X, and Linux systems if they have Java installed on them. At its web site evolution.gs.washington.edu/popgen/ is a downloadable "zip archive" which contains a Java archive file which has the Java executable as well as the Java source code. The Java source for popg is called PopGUserInterface.java and is in the folder src. Getting PopG You can fetch PopG using the links below. We have posted a Zip archive of PopG, including Java archives and documentation files. Fetch it here. Installing PopG Here are instructions for saving, unpacking, and installing PopG from different browsers, and on operating systems. Using Chrome on Windows, Mac OS X, or Linux Click on the link. New Run
I need a step by step description of DNA replication 1) The enzyme DNA Helicase "unzips" the DNA double helix, breaking the hydrogen bonds that hold the nitrogen bases together. 2) Enzymes are added to the two separated strand portions so that the strands don't twist around and come back together. The two areas on either end of the DNA where the double helix separates are called replication forks. 3) DNA Polymerase glides along the exposed strands, adding complementary nucleotides to the existing ones. 4) When DNA Polymerase is done, two identical strands of DNA have been formed- each containing one old strand and one new strand. Side note: In DNA replication, mutations can sometimes occur when the wrong nucleotide is added.
Friends Have More DNA in Common Than Strangers People may unsuspectingly choose friends who have some DNA sequences in common with them, a new analysis finds. Researchers compared gene variations between nearly 2,000 people who were not biologically related, and found that friends had more gene variations in common than strangers. The study lends a possible scientific backing for the well-worn clichés, "We're just like family," or "Friends are the family you choose," the researchers said. NEWS: How The Sun Changes Your DNA "Humans are unique in that we create long-term connections with people of our species," said Nicholas Christakis, a social scientist at Yale University involved in the study. The researchers did the study because they wanted "to provide a deep evolutionary account of the origins and significance of friendship," Christakis said. The most common gene shared by friends was the "olfactory" gene, which is involved in a person's sense of smell. VIDEO: 98 Percent Of Your DNA Is Junk VIDEO: Imaginary Friends Make You Awesome
Visualizing How A Population Grows To 7 Billion 7 Billion: How Did We Get So Big So Fast? Watch as global population explodes from 300 million to 7 billion. Sometime Monday, the world will have more humans than ever: 7 billion, according to the U.N. The U.N. estimates that the world's population will pass the 7 billion mark on Monday. Much of that growth has happened in Asia — in India and China. Due in part to that region's extreme poverty, infant mortality rates are high and access to family planning is low. As NPR's Adam Cole reports, it was just over two centuries ago that the global population was 1 billion — in 1804. As higher standards of living and better health care are reaching more parts of the world, the rates of fertility — and population growth — have started to slow down, though the population will continue to grow for the foreseeable future. U.N. forecasts suggest the world population could hit a peak of 10.1 billion by 2100 before beginning to decline.
3D Animation Library Animations can be viewed within your web browser or downloaded for play from your computer. In some genes the protein-coding sections of the DNA ("exons") are interrupted by non-coding regions ("introns"). RNA splicing removes the introns from pre mRNA to produce the final set of instructions for the protein. Transcript: As DNA is transcribed into RNA it needs to be edited to remove non-coding regions, or introns, shown in green. This editing process is called splicing, which involves removing the introns, leaving only the yellow, protein-coding regions, called exons. RNA splicing begins with assembly of helper proteins at the intron/exon borders. This process is repeated for every intron in the RNA.
Genetic Education Resources for Teachers Genetic Education Resources for Teachers As genetics and genomics research advances rapidly through the knowledge gained from the completed human DNA sequence, teachers and educators require new classroom tools to present the rich history, complexity and excitement of the world of genetics and genomics.These teaching resources include specific teaching plans to present the history, facts and genetic terminology behind the Human Genome Project. Teaching Resources Internet-Based Tools for Teaching the Microbiome Websites, articles, research studies and more to help teach about the microbiome. Learning Tools The GeneEd Website The National Library of Medicine's genetics, education and discovery website. To view the PDFs on this page you will need Adobe Reader. To view the MS Word file on this page, you will need MS Word. To view the MS PowerPoint presentation on this page, you will need MS PowerPoint. Top of page
Starch and Cellulose Starch and cellulose are two very similar polymers. In fact, they are both made from the same monomer, glucose, and have the same glucose-based repeat units. There is only one difference. In starch, all the glucose repeat units are oriented in the same direction. But in cellulose, each succesive glucose unit is rotated 180 degrees around the axis of the polymer backbone chain, relative to the last repeat unit. When bigshot scientists are talking bigshot scientist talk they say that the glucose units in starch are connected by alpha linkages, and that the glucose units in cellulose are connected by beta linkages. Does this make any difference? Cellulose is a lot stronger than starch.