Question

explain what “complementary base pairing” means. given the nucleotide sequence a - t - g - g - c - a, what would be the sequence on the complementary strand? how does the molecular structure of base pairs ensure that two strands of dna are complementary? many proteins “contact” or bind with dna. where does dna - protein binding typically occur, and why?

Explanation:

Complementary base - pairing in DNA is the specific bonding between bases. Adenine (A) pairs with Thymine (T) via two hydrogen bonds, and Guanine (G) pairs with Cytosine (C) via three hydrogen bonds. For the sequence A - T - G - G - C - A, the complementary strand is T - A - C - C - G - T. The molecular structure of base pairs ensures complementarity as the hydrogen - bonding patterns are specific and allow only certain base combinations. DNA - protein binding typically occurs in the major and minor grooves of the DNA double - helix because these areas expose functional groups of the bases that can interact with the amino acids of the protein.

Answer:

Complementary base - pairing is the specific pairing of bases in DNA (A - T, G - C). Complementary strand for A - T - G - G - C - A is T - A - C - C - G - T. Base - pair structure ensures complementarity through specific hydrogen - bonding. DNA - protein binding occurs in major and minor grooves due to exposed base functional groups for interaction.