Origin and evolution of life

    • Genomics Meets Geology
      Chemist Steven A. Benner and his colleagues are combining chemistry and geological history in an approach to understand life on Earth.
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    • The Three Domains of Life
      When scientists first started to classify life, everything was designated as either an animal or a plant. But as new forms of life were discovered, the original classification was not sufficient enough to organize the diversity and complexity of life.
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    • Test-tube RNA
      Research done by scientists at the Whitehead Institute for Biomedical Research offers insights into evolutionary origins of life.
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    • The Oldest Life on Land
      Fossilized remnants of a microbial mat provide evidence that life existed on land as early as 2.6 to 2.7 billion years ago. The findings suggest that an oxygen atmosphere and a protective ozone layer were in place around Earth by that time.
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    • Clues to the Last Common Ancestor
      Molecular detectives have traced human ancestry back to the so-called Mitochondrial Eve, the last female common ancestor. More recent research has posited a Y-chromosome Adam, the last male common ancestor.
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    • Genetic Alchemy: Turning Lobsters into Fruit Flies
      Biologists at the University of California, San Diego, now have genetic evidence that explains how such drastic alterations to body plans were able to occur during the early evolution of animals.
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    • Em um eucarionte, o DNA está localizado no núcleo da célula. Uma molécula de DNA é composta por duas cadeias helicoidais espiraladas, cada uma composta por uma cadeia linear de açúcar e moléculas de fosfato. Crédito: MIT.
      Quando os cientistas começaram a classificar a vida, tudo foi designado como animal ou planta. Mas enquanto novas formas de vida eram descobertas, a classificação original não foi suficiente para organizar a diversidade e complexidade da vida.
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    • One-Handed Life
      Scientists with the NASA Astrobiology Institute have created self-replicating molecules that produce only "left-handed molecules or only "right-handed molecules.The findings may help explain why life is based on left-handed amino acids.
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    • Advances in our Understanding of Life
      Over the past two decades, advances in a number of scientific disciplines have helped us better understand the nature and evolution of life on Earth. These scientific developments also have helped lay the foundation for astrobiology, opening up new possibilities for the existence of life
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    • Jurassic Spark: Early Ancestor of Mammals Found
      What is nearly 200 million years old, furry, weighed less than a paper clip and scurried beneath the feet of dinosaurs? A team of fossil-finders, led by researchers at Pittsburgh's Carnegie Museum of Natural History, suggest the answer may include one of your relatives -
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    • Life’s Baby Steps
      Billions of years ago, amino acids somehow linked together to form chainlike molecules. Now scientists have discovered what may be a key step in this process - a step that has baffled researchers for more than a half a century.
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    • Reflections From a Warm Little Pond
      Scientists theorize possible scenarios on how life could have first originated on Earth.
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    • Oily fossils provide clues to the evolution of flowers
      A team of Stanford geochemists has found evidence that flowering plants may have evolved 250 million years ago - long before the first pollen grain appeared in the fossil record.
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    • Evo Devo Learns a Larval Lesson
      Scientists have studied the life history of animals, part of a field called development, for many decades. Other scientists have studied how life arose and evolved on Earth.
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    • TNA World
      DNA is the building block for life on Earth. But it is a highly complex molecule, and could not have arranged itself spontaneously. What did it develop from? Astrobiologists examine possible ancestors of DNA: nucleic acids called PNA, p-RNA, and TNA.
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