To achieve a consistent distance across the width of the DNA strand,the nucleotide base guanine (G)can only be paired with:

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Four nucleotide bases-adenine (A),thymine (T),guanine (G),and cytosine (C)-comprise the "letters" in the genetic DNA "alphabet." The bases in the double helix are paired T with A and G with C.The nucleotide bases are designed so that only G can pair with C and only T can pair with A to achieve a consistent distance across the width of the DNA strand.The TA and GC combinations are known as base pairs.

To Achieve a Consistent Distance Across the Width of the DNA