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The RNA world is a hypothetical stage in the evolutionary history of life on Earth in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. [1] The term also refers to the hypothesis that posits the existence of this stage. Alexander Rich first proposed the concept of the RNA world in 1962, [2] and Walter ...
The Necromancer, a shadowy evil character mentioned in The Hobbit. [T 20] In The Lord of the Rings, the Necromancer is revealed to be Sauron. [T 21] (mentioned only) Smaug, a great dragon who made the Lonely Mountain his lair. [T 1] After the Company roused him from his long quiescence, he destroyed Lake-town and was killed by Bard the Bowman ...
Ribonucleic acid (RNA) is a polymeric molecule that is essential for most biological functions, either by performing the function itself (non-coding RNA) or by forming a template for the production of proteins (messenger RNA). RNA and deoxyribonucleic acid (DNA) are nucleic acids. The nucleic acids constitute one of the four major ...
John Atkins is an active proponent of the RNA World hypothesis and is an editor of The RNA World and RNA Worlds books. [10] [11] [12] His research activities include a search for modern protein-free RNA-based life forms. [13] In 2013 John Atkins organized installation of Charles Jencks sculpture ?What is Life? in Irish National Botanic Gardens ...
A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells. Organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms. Most prokaryotes are unicellular and are classified into bacteria and archaea.
The HIV rev-RRE interaction (1993) Doctoral advisor. Jack Szostak. David P. Bartel is an American molecular biologist best known for his work on microRNAs. Bartel is a Professor of Biology at the Massachusetts Institute of Technology, Member of the Whitehead Institute, and investigator of the Howard Hughes Medical Institute (HHMI).
In biochemistry, a ribonucleotide is a nucleotide containing ribose as its pentose component. It is considered a molecular precursor of nucleic acids. Nucleotides are the basic building blocks of DNA and RNA. Ribonucleotides themselves are basic monomeric building blocks for RNA. Deoxyribonucleotides, formed by reducing ribonucleotides with the ...
The first universal common ancestor (FUCA) is a proposed non-cellular entity that was the earliest organism with a genetic code capable of biological translation of RNA molecules into peptides to produce proteins. [1][2] Its descendents include the last universal common ancestor (LUCA) and every modern cell. [1][3] FUCA would also be the ...