#Redirect ==Key Stage 4=====Meaning==='''Nucleotide bases''' are the different '''bases''' which can be part of a [[nucleotide]] [[monomer]]. ===About NucleotideBases===There are 4 [[Nucleotide Base|nucleotide bases]]:*[[Adenine]]*[[Thymine]]*[[Guanine]]*[[Cytosine]]: The '''nucleotide bases''' are arranged in complementary pairs. [[Adenine]] and [[Thymine]] pair up on opposite sides of the [[DNA]] strand. The same is true for [[Cytosine]] and [[Guanine]]. When the strand is pulled into two pieces this allows the [[DNA]]to make two exact copies of itself. So if one side of the strand has the code AAAACCCTTG then the other will have the code TTTTGGGAAC.