Final answer:
The complementary strand of the DNA sequence AATCATGGA is TTAGTACCT, according to base pairing rules where A pairs with T and C pairs with G.
Step-by-step explanation:
To determine the strand of DNA complementary to AATCATGGA, we must look at the base pairing rules: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G). Thus, for the given sequence AATCATGGA, the complementary DNA strand would be constructed by replacing each A with T, each T with A, each C with G, and each G with C. Applying this rule, we get the complementary strand as follows:
- A becomes T
- A becomes T
- T becomes A
- C becomes G
- A becomes T
- T becomes A
- G becomes C
- G becomes C
- A becomes T
Thus, the complementary strand is TTAGTACCT, which corresponds to option 2 in the given choices.