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exon
1[ ek-son ]
noun
- (in Britain) one of four yeomen of the guard who act as commanding officers in the absence of higher authority.
exon
2[ ek-son ]
noun
, Genetics.
- any portion of an interrupted gene that is represented in the RNA product and is translated into protein.
exon
1/ ˈɛksɒn /
noun
- one of the four officers who command the Yeomen of the Guard
exon
2/ ˈɛksɒn /
noun
- any segment of a discontinuous gene the segments of which are separated by introns Compare intron
exon
/ ĕk′sŏn /
- A segment of a gene that contains information used in coding for protein synthesis. Genetic information within genes is discontinuous, split among the exons that encode for messenger RNA and absent from the DNA sequences in between, which are called introns . Genetic splicing, catalyzed by enzymes, results in the final version of messenger RNA, which contains only genetic information from the exons.
- Compare intron
exon
- Stretches of DNA in genes that code for proteins . In eukaryotes , exons in a given gene are generally separated from each other by stretches of DNA that do not contain instructions for constructing proteins. ( Compare intron .)
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Derived Forms
- exˈonic, adjective
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Word History and Origins
Origin of exon1
1645–55; earlier exant, for French exempt (spelling altered to show French pronunciation)
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Word History and Origins
Origin of exon1
C17: a pronunciation spelling of French exempt exempt
Origin of exon2
C20: from ex- 1+ -on
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Example Sentences
In 1837 he was appointed exon of the Yeomen of the Guard, which he held up to 1849.
From Project Gutenberg
Exon librum istum cum pari suo, in festo Annuntiationis Dominice.
From Project Gutenberg
But, it will be seen, the 'tenuit' of Domesday is equated by the 'emit' of the Exon book.
From Project Gutenberg
We have not seen dominicum used as a substantive; but in the Exon.
From Project Gutenberg
I do not believe that there could be found under heaven another man like this exon.
From Project Gutenberg
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