Question

1. why is complementary base pairing essential? a it creates proteins b it ensures accurate dna replication c it slows mutation rate to zero d it helps cells divide

Explanation:

Complementary base pairing (A - T/U, G - C) is crucial in DNA replication. During replication, the two strands of DNA separate. Each strand serves as a template. Due to complementary base pairing rules, new nucleotides are added precisely. For example, if the template strand has an A, a T (in DNA) or U (in RNA during transcription - related processes but here for replication focus on DNA - DNA) will pair with it. This ensures that the new DNA molecule formed is an accurate copy of the original. Proteins are created through translation (not directly by base - pairing in the way asked here). Mutation rate cannot be slowed to zero as there are still factors like radiation, chemical mutagens etc. that can cause mutations. Cell division is a complex process involving many steps like mitosis/meiosis phases, not directly because of base - pairing in the sense of the core function of base - pairing.

Answer:

B. It ensures accurate DNA replication