A nurse reviewing the binding sequence of the human gene realizes that guanine will always bind with:
1. Cytosine.
2. Adenine.
3. Phosphate.
4. Thymine.
Cytosine.
Rationale: DNA is composed of four nucleotide bases, adenine (A), cytosine (C), guanine (G), and thymine (T), with the addition of sugar (deoxyribose) and phosphate. The purine bases are A and G, and the pyrimidine bases are C and T. In DNA, purines and pyrimidines always pair in a complementary nature so that A always binds to T and C always binds to G.
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