If DNA replication occurs by unwinding and rebuilding, then:
a) the two resulting DNA molecules are an unpredictable mixture of old and newly synthesized DNA.
b) the two resulting DNA molecules each contain one original strand and one new strand.
c) the two resulting DNA molecules are completely composed of newly synthesized strands.
d) both A and B are true.
e) None of the above is true about DNA replication.
Answer: b) the two resulting DNA molecules each contain one original strand and one new strand.