Transcription of two genes. (a) RNA polymerase moves from the 3â² end of the template strand, creating an RNA strand that grows in a 5â² â 3â² direction (because it must be antiparallel to the template strand).
The atoms in sugar do not form ions; instead, they share their electrons. The type of bond that forms from the sharing of electrons between the atoms of the table sugar is a covalent bond. Table sugar has a much more complex chemical structure than salt.
The base is attached to the sugar by a b-N -glycosidic bond attached to nitrogen number 1 of the pyrimidine or number 9 of the purine.A molecule comprising the sugar joined to a base is called a nucleoside. This is converted into a nucleotide by attachment of a phosphate group to the 5â carbon of the sugar.