Recall that dna is
made from a sequence of four nucleotides that differ in terms of which nitrogen
base a, t,g, c is present in each nucleotide. suppose
you have a region of dna which is 100 nucleotides long. how many possible
nucleotide sequences are there for this region of dna?

25 nucleotide sequence pair

Explanation:

There are four nucleotide sequence pair present in DNA. and if we have 100 nucleotide so 25 nucleotide sequence pairs will be formed and each pair contains adenine (A), cytosine (C), guanine (G), and thymine (T).

Cytosine nucleotide paired with guanine nucleotide and Adenine nucleotide paired with thymine nucleotide . They have hydrogen bonds between each bases.  

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