Daughter DNA is described as...

• A. DNA molecules each consisting of one parental strand and one new strand.
• B. DNA molecules consisting of two parental strands.
• C. DNA molecules containing only newly synthesized strands.
• D. DNA molecules with three strands.

Answer: (A)

DNA replication is semi-conservative: after one round, each daughter DNA molecule contains one strand from the original molecule and one newly synthesized strand. The old strand serves as a template, and DNA polymerase builds the complementary new strand using base-pairing rules. This means you end up with two DNA molecules, each with one parental strand and one new strand. The other possibilities describe models where both strands are old, both are new, or an impossible three-stranded molecule, which don’t occur in standard replication.