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DNA exists in many possible conformations that include A-DNA, B-DNA, and Z-DNA forms, although only B-DNA and Z-DNA have been directly observed in functional organisms. [14] The conformation that DNA adopts depends on the hydration level, DNA sequence, the amount and direction of supercoiling, chemical modifications of the bases, the type and ...
Deoxyribonucleic acid (DNA) is a nucleic acid containing the genetic instructions used in the development and functioning of all known living organisms. The chemical DNA was discovered in 1869, but its role in genetic inheritance was not demonstrated until 1943. The DNA segments that carry this genetic information are called genes.
DNA can be copied very easily and accurately because each piece of DNA can direct the assembly of a new copy of its information. This is because DNA is made of two strands that pair together like the two sides of a zipper. The nucleotides are in the center, like the teeth in the zipper, and pair up to hold the two strands together.
Databases include Find a Grave, RootsWeb, a free genealogy community, and Newspapers.com. Archives.gov: US National Archives and Records Administration. Free online repository with a section dedicated to genealogical research [1] BALSAC: Population database of Quebec, Canada Cyndi's List: Thousands of resource links, categorized and cross ...
There is a well-known myth about the word quiz that says that in 1791, a Dublin theatre owner named Richard Daly made a bet that he could introduce a word into the language within 24 hours. He then went out and hired a group of street children to write the word "quiz", which was a nonsense word , on walls around the city of Dublin .
Wikipedia for Schools is a selection of articles from Wikipedia produced by international children's charity SOS Children and most recently updated in 2013. It was originally produced as a learning resource for schools in countries where Internet access is limited, though it has also enjoyed significant success in the developed world.
BBC Learning English is a department of the BBC World Service devoted to English language teaching. The service provides free resources and activities for teachers and students, primarily through its website. It also produces radio programmes which air on some of the BBC World Service's language services and partner stations.
GCFLearnFree.org was created in July 2000 by Goodwill Community Foundation Inc president Dennis McLain as an online training program with both English and Spanish language lessons. [2] The program was funded through revenue generated from the value of donated items to Goodwill Community Foundation (GCF).
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