DNA stands for deoxyribonucleic acid and is responsible for carrying the genetic instructions in organisms. It is a double-stranded molecule, that is, the molecule has two parts (or rather, chains) which are connected to each other. A DNA molecule has a number of bases in it. These include the purine bases (such as adenine and guanine) and pyrimidine bases (such as thymine and cytosine). These bases pair up with a complementary base and that is how the complementary strands of DNA molecules are connected to each other. For reference, adenine (or A) always pairs up with thymine (or T). Similarly, cytosine (or C) always pairs up with guanine (or G).
Thus, if the DNA molecule sequence on one of the strands is ATCGTA, the complementary strand will be TAGCAT.
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