AP BIOLOGY

Detailed explanation-1: -In the helical structure of DNA, the two strands are held together by hydrogen bonds between specific pairs of bases. Cytosine forms hydrogen bond with guanine, while adenine forms hydrogen bond with thymine. As a result, the two strands are complementary to each other.

Detailed explanation-2: -Base Pair A base pair consists of two complementary DNA nucleotide bases that pair together to form a “rung of the DNA ladder.” DNA is made of two linked strands that wind around each other to resemble a twisted ladder-a shape known as a double helix.

Detailed explanation-3: -The two strands of DNA are complementary, meaning that the base sequence / the sequence of bases in one strand can help create the correct sequence of bases in the other strand. Because of this complementarity of the two strands, having one strand means that the recreation of the other strand is possible.

Detailed explanation-4: -Complementary Sequence: Since DNA has two strands, every DNA sequence has a complementary sequence running parallel. In the complementary sequence, Adenine (A) is always paired with Thymine (T), and Cytosine (C) is always paired with Guanine (G).