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NUCLEIC ACUD, DNA REPLICATION AND PROTEIN SYNTHESIS Mohammed Majeed Biology key skills Poodles make more poodles. Sheep make more sheep. Replication is a basic fact of life. All living things make other living things that are to one degree or another duplicates of themselves. What is the mechanism behind all this? The answer lies in a molecule called DNA. In 1869, Friedrich Miescher extracted a substance, which he called nuclein from the nuclei of white blood cells. Nuclein later became known as nucleic acid. Living cells contain two kinds of nucleic acids-ribonucleic acid (RNA) which contains the sugar, ribose and deoxyribonucleic (DNA) which contains the sugar, deoxyribose. Nucleic acids are found in all living things, from the simplest protozoan to the most complex forms of animal and plant life . Two young scientists-James Watson and Francis Crick-finally pieced together the precise structure of DNA. The model proposed by Watson and Crick for the structure of DNA...

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