DNA Structure
DNA has (a) a double helix structure and (b) phosphodiester bonds. The (c) major and minor grooves are binding sites for DNA binding proteins during processes such as transcription (the copying of RNA from DNA) and replication.
Source
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"OpenStax College, DNA Structure and Sequencing. October 16, 2013."
http://cnx.org/content/m44486/latest/Figure_14_02_03abc.jpg
OpenStax CNX
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