This time we are looking on the crossword clue for: ___ qua non.
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Possible Answers: SINE.
Last seen on: –Daily Gulf News Crossword Answers Thursday, 14 March 2024
–NY Times Crossword 27 Jun 2018, Wednesday
–NY Times Crossword 10 Jun 2018, Sunday
Random information on the term “SINE”:
Retrotransposons (also called transposons via RNA intermediates) are genetic elements that can amplify themselves in a genome and are ubiquitous components of the DNA of many eukaryotic organisms. These DNA sequences use a “copy-and-paste” mechanism, whereby they are first transcribed into RNA, then converted back into identical DNA sequences using reverse transcription, and these sequences are then inserted into the genome at target sites.
Retrotransposons form one of the two subclasses of transposons, where the others are DNA transposons, which does not involve an RNA intermediate.
Retrotransposons are particularly abundant in plants, where they are often a principal component of nuclear DNA. In maize, 49–78% of the genome is made up of retrotransposons. In wheat, about 90% of the genome consists of repeated sequences and 68% of transposable elements. In mammals, almost half the genome (45% to 48%) is transposons or remnants of transposons. Around 42% of the human genome is made up of retrotransposons, while DNA transposons account for about 2–3%.