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  2. H&R Block - Wikipedia

    en.wikipedia.org/wiki/H&R_Block

    H&R Block acquired MECA Software, a 1980s PFM company that created the TaxCut software, in 1993. In 1995, H&R Block sold MECA, but retained TaxCut. The company began to expand in the 1990s into the financial services arena, offering mortgage loans, banking and business services.

  3. DNA - Wikipedia

    en.wikipedia.org/wiki/DNA

    DNA is a long polymer made from repeating units called nucleotides, each of which is usually symbolized by a single letter: either A, T, C, or G. Chargaff's rules state that DNA from any species of any organism should have a 1:1 protein stoichiometry ratio (base pair rule) of purine and pyrimidine bases (i.e., A+T=G+C) and, more specifically, that the amount of guanine should be equal to ...

  4. DNA replication - Wikipedia

    en.wikipedia.org/wiki/DNA_replication

    DNA polymerases are a family of enzymes that carry out all forms of DNA replication. DNA polymerases in general cannot initiate synthesis of new strands, but can only extend an existing DNA or RNA strand paired with a template strand.

  5. Single-nucleotide polymorphism - Wikipedia

    en.wikipedia.org/wiki/SNP_mutation

    The upper DNA molecule differs from the lower DNA molecule at a single base-pair location (a C/A polymorphism) In genetics , a single-nucleotide polymorphism ( SNP / s n ɪ p / ; plural / s n ɪ p s / ) is a substitution of a single nucleotide at a specific position in the genome that is present in a sufficiently large fraction of the ...

  6. DNA repair - Wikipedia

    en.wikipedia.org/wiki/DNA_repair

    DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA damage, resulting in tens of thousands of individual molecular lesions per cell per day.

  7. Adolf Hitler - Wikipedia

    en.wikipedia.org/wiki/Adolf_Hitler

    Adolf Hitler (German: [ˈadɔlf ˈhɪtlɐ] (); 20 April 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Germany from 1933 to 1945. He rose to power as the leader of the Nazi Party, becoming Chancellor in 1933 and then assuming the title of Führer und Reichskanzler in 1934.

  8. Jefferson–Hemings controversy - Wikipedia

    en.wikipedia.org/wiki/Jefferson–Hemings...

    The Jefferson–Hemings controversy is a historical debate over whether there was a sexual relationship between U.S. President Thomas Jefferson and his slave, Sally Hemings, and whether he fathered some or all of her six recorded children.

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