Question

after a dna molecule is replicated in dna replication, the result would be

two dna molecules and each is made of 2 newly made strands.
two dna molecules and each is made of one old strand and one newly made strand.
four dna molecules and each is made of two newly made strands.
four dna molecules and each is made of one old strand and one newly made strand.

Explanation:

DNA replication follows a semi - conservative model. In this model, the double - stranded DNA molecule unwinds, and each strand serves as a template for the synthesis of a new complementary strand. So, when one DNA molecule replicates, it results in two DNA molecules. Each of these new DNA molecules consists of one original (old) strand and one newly synthesized strand.

Answer:

two DNA molecules and each is made of one old strand and one newly made strand.