If reading the DNA in the same direction ie 5' to 3' it would be ATC, however when bound to the complement it would sit in the reverse order - 3' to 5' and would read CTA.
Each DNA base bonds with a certain one on the other strand. A binds to T, and C binds to G. This means the complementary sequence of ATCGGTAC is TAGCCATG.
The complementary sequence of a DNA strand is written with the beginning letters of the bases: adenine (A), cytosine (C), guanine (G), and thymine (T). You would replace each letter with its...