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If one strand of DNA has the sequence AT...

If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be

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In a DNA molecule, adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G). Thus, sequence of bases in one strand :
ATGCTTCA
`therefore`.
Sequence of bases in complimentary strand is : TACGAAGT
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