Final Answer:
Double-stranded DNA has a fairly consistent structure because of the extensive base pairing along the complementary sequences.
Step-by-step explanation:
The statement refers to the double helical structure of DNA, discovered by James Watson and Francis Crick. In this structure, two strands of DNA wind around each other, forming a double helix. The consistency arises from the specific base pairing between adenine (A) and thymine (T), as well as between guanine (G) and cytosine (C). Adenine always pairs with thymine, forming two hydrogen bonds, while guanine pairs with cytosine, forming three hydrogen bonds. This complementary base pairing ensures that the width of the double helix remains constant. The consistency in structure is crucial for DNA's function, allowing accurate replication and transmission of genetic information.