If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

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A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together.

Adenine base pairs with thymine with $2$ hydrogen bonds and cytosine base pairs with guanine with $3$ hydrogen bonds.

As we know that in DNA molecule , adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G).

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