Question

When DNA is duplicated during mitosis, _____.

one completely new DNA molecule is formed
two completely new DNA molecules are formed
two molecules are formed, each with one original side
the original molecule thickens and separates into two

Answer 1

Two molecules are formed, each with one original side.

Answer 2

Two molecules are formed each with one original side.

aka semi-conservative replication(the resulting double helix is composed of both an old strand and a new strand)

Hope this helps:)