American Journal of Botany, Vol. 52, No. 9 (Oct., 1965), pp. 900-910 (11 pages) The purine analogs, 8-azaadenine, 8-azaguanine, 8-azaxanthine and 8-azahypoxanthine, and the pyrimidine analogs, ...

Nucleotides are essential to all life on Earth as they form the building blocks of DNA or RNA, and understanding how they were first made is a long-standing challenge that must be resolved to ...

How life on Earth first started is a mystery mankind has grappled with for thousands of years. Scientists generally agree that all life must have evolved from single-celled organisms that first ...

A single process for how a group of molecules called nucleotides were made on the early Earth, before life began, has been suggested by a UCL-led team of researchers. Nucleotides are essential to all ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, No. 1 (January 2, 2018), pp. 36-40 (5 pages) Aqueous microdroplets (<1.3 μm in diameter on average) ...

A METHOD was recently developed in this laboratory by which it was possible to degrade DNA chemically to sequences of purine nucleotides 1,2. During this procedure the DNA is first freed of ...

This image illustrates the chemical structure of a purine molecule, highlighting the numbering of the carbon and nitrogen atoms. The purine structure consists of a pyrimidine ring (positions 1 to 6) ...

Using new analyses, scientists have just found the last two of the five informational units of DNA and RNA that had yet to be discovered in samples from meteorites. While it is unlikely that DNA could ...

Megaloblastic maturation is the morphologic result of any biochemical defect that causes a slowing of DNA synthesis. The hallmark of this megaloblastosis is nuclear-cytoplasmic dissociation; the ...