Final answer:
DNA is made up of two complementary strands that are antiparallel to each other. Adenine pairs with thymine, and cytosine pairs with guanine.
Step-by-step explanation:
A DNA molecule is made up of two complementary strands that are antiparallel to each other. The two strands are connected by hydrogen bonds between the nitrogenous bases. Adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G).
Based on the given sequence T-A-C-A-A-A-A-C-T, the complementary strand can be determined by pairing the appropriate bases. Therefore, the complementary strand will be 3'-AGGTACTCAACT-5'.