If one side of a DNA molecule strand was TAAGCT, what would the other
side be?

Adenine always bonds with thymine, and guanine only bonds with cytosine. In RNA however, uracil (U) is substituted for thymine instead. So, in translation, adenine turns into thymine, and guanine turns into cytosine, and vice-versa. So, the complementary would be read as taagct

Explanation:

geologic time scale (for gradpoint) =)