Final answer:
It is true that Adenine pairs with Thymine via two hydrogen bonds and Guanine pairs with Cytosine via three hydrogen bonds in DNA. For a DNA sequence of ATTG, the complementary strand would be TAAC.
Step-by-step explanation:
The claim that Adenine will always go with Thymine in a double bond and Guanine will always go with Cytosine in a triple bond is true. In the DNA double helix structure, complementary base pairing rules state that Adenine (A) pairs with Thymine (T) through two hydrogen bonds, and Guanine (G) pairs with Cytosine (C) through three hydrogen bonds.
Considering the DNA sequence ATTG, the corresponding bases it would bind to on the opposite strand would be TAAC. This follows because A pairs with T, and G pairs with C following the complementary base pairing rules.