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  4. The sequence of nitrogenous bases in one strand of DNA are 3' TAC GCG ACG 5'. The complementary DNA strand should have

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Q. The sequence of nitrogenous bases in one strand of DNA are 3' TAC GCG ACG 5'. The complementary DNA strand should have

KCETKCET 2013Molecular Basis of Inheritance

Solution:

Two strands of DNA molecules are held together by hydrogen bonds between their bases. Adenine (A), a purine of one chain lies exactly opposite thymine (T), a pyrimidine of the other chain. Similarly, Cytosine (C), a pyrimidine lies opposite guanine (G) a purine. Thus the complementary strand would be 5' - ATG CGC TGC - 3'.