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DNA is made up of different units called nucleotides. There are a variety of four different nucleotides that make up the polymer that is DNA[1]. DNA consists of two different regions, one being exons and the other introns. The regions of exons in the DNA consist of fewer nucleotides than the regions of introns and are the regions that code for proteins[2]. It is also now thought that enhancer sequences for regulation of gene transcription is not just found in introns but also exons[3]. Exons are the coding regions of a gene and are separated by regions of introns; they are copied during transcription (along with introns) to produce pre-mRNA[4].


  1. Alberts .B. (2008) Molecular Biology of the Cell, 5th Edition, New York: Garland Science
  2. Gilbert W, 1978 "Why genes in pieces?", Nature, 271 (5645): 501
  3. Purnel;, B. Exons. Exons Encode Enhancers. Science 2012. Vol:336(6079), pp.277-277
  4. Editors. Exon - Definition, Structure and Function. https://biologydictionary.net/exon/.
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