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Rosalind Elsie Franklin (25 July 1920 – 16 April 1958) [1] was a British chemist and X-ray crystallographer whose work was central to the understanding of the molecular structures of DNA (deoxyribonucleic acid), RNA (ribonucleic acid), viruses, coal, and graphite. [2] Although her works on coal and viruses were appreciated in her lifetime ...
The two base-pair complementary chains of the DNA molecule allow replication of the genetic instructions. The "specific pairing" is a key feature of the Watson and Crick model of DNA, the pairing of nucleotide subunits. [5] In DNA, the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine. The A:T and C:G pairs ...
H&R Block, Inc. H&R Block, Inc., or H&R Block, is an American tax preparation company operating in Canada, the United States, and Australia. The company was founded in 1955 by brothers Henry W. Bloch and Richard Bloch. As of 2018, H&R Block operates approximately 12,000 retail tax offices staffed by tax professionals worldwide.
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Single sign-on. Single sign-on (SSO) is an authentication scheme that allows a user to log in with a single ID to any of several related, yet independent, software systems. True single sign-on allows the user to log in once and access services without re-entering authentication factors. It should not be confused with same-sign on (Directory ...
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4. Relatives. Richard Bloch (brother) Henry Wollman Bloch (July 30, 1922 – April 23, 2019) was an American businessman and philanthropist who was the co-founder and (since 2000) [1] the chairman emeritus of the American tax-preparation company H&R Block. He and his brother, Richard Bloch, founded H&R Block in 1955 in Kansas City, Missouri.
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