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  1. A vitamin is a chemical compound that is needed in small amounts for the human body to work correctly. They include Vitamin A, many B vitamins (like B 1, B 2, B 3, B 6, and B 12 ), Vitamin C, Vitamin D, Vitamin E, and Vitamin K. For example, citrus fruits such as oranges and lemons contain vitamin C.

  2. This article lists the 50 states of the United States. It also lists their populations, the date they became a state or agreed to the United States Declaration of Independence, their total area, land area, water area, and the number of representatives in the United States House of Representatives.

  3. This is a list of traditional abbreviations for U.S. states and territories These abbreviations (short names) were used in mailing addresses before the introduction of two-letter U.S. postal abbreviations. The traditional abbreviations are still commonly used in other ways besides mailing addresses. For example, they can be used in ...

    • Structure of DNA
    • Copying DNA
    • Protein Synthesis
    • History of DNA Research
    • What Happens When DNA Gets Damaged
    • DNA and Privacy Concerns
    • Related Pages

    DNA has a double helix shape, which is like a ladder twisted into a spiral. Each step of the ladder is a pair of nucleotides.

    When DNA is copied, this is called DNA replication. Briefly, the hydrogen bonds holding together paired bases are broken and the molecule is split in half: the legs of the ladder are separated. This gives two single strands. New strands are formed by matching the bases (A with T and G with C) to make the missing strands. First, an enzyme called DNA...

    A section of DNA that contains instructions to make a protein is called a gene. Each gene has the sequence for at least one polypeptide. Proteins form structures, and also form enzymes. The enzymes do most of the work in cells. Proteins are made out of smaller polypeptides, which are formed of amino acids. To make a protein to do a particular job, ...

    DNA was first isolated (extracted from cells) by Swiss physician Friedrich Miescher in 1869, when he was working on bacteria from the pus in surgical bandages. The molecule was found in the nucleus of the cells and so he called it nuclein. In 1928, Frederick Griffith discovered that traits of the "smooth" form of Pneumococcus could be transferred t...

    DNA gets damaged a lot of times in cells which is a problem has DNA provide instructions to making proteins. But, cells have ways to fix these problems most of the time. Cells make use of special enzymes. Different enzymesfix different types of damages to DNA. The problem comes in different types: 1. One common error is base mismatch or where the b...

    Police in the United States used DNA and family tree public databases to solve cold cases. The American Civil Liberties Unionraised concerns over this practice.

  4. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any ...

  5. Twelve people have walked on Earth's Moon. The first one was Neil Armstrong and the last one was Harrison Schmitt. All crewed moon landings took place between July 1969 and December 1972 as part of the United States Apollo program. All twelve people who have walked on the Moon are American men.

  6. Beginning. Some examples. Names for large numbers. History. References. Other websites. Names of large numbers. Numbers that are larger than one million are usually either represented using scientific notation, or by words. [1] There are two main ways of using words to write large numbers.

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