Question

multiple choice
the newly synthesized dna is packaged into one nucleus, and the original dna is packaged into another nucleus.
each existing strand is used as a template for making a new strand.
the two strands are separated.
synthesis of both new strands is in the 5 to 3 direction.

Explanation:

In DNA replication, the double - stranded DNA molecule unwinds and each of the existing strands serves as a template for the synthesis of a new complementary strand. This is the semi - conservative model of DNA replication. The first option is incorrect as DNA replication doesn't package new and original DNA into separate nuclei in this way. The separation of the two strands is just the first step of replication, and the direction of synthesis is a characteristic of the process but not the most defining feature of the overall replication mechanism.

Answer:

Each existing strand is used as a template for making a new strand.