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  4. If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be

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Q. If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be

KEAMKEAM 2008Biomolecules

Solution:

In DNA, adenine (A) and thymine (T) are joined by two hydrogen bonds while guanine (G) and cytosine (C) are joined by three hydrogen bonds. No other combination of four bases is possible. Hence, the sequence of complementary strand is TACGAACT.