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.
This is because the starting DNA molecule undergoing mitosis splits in half and the other half is completed by free nucleotides using the enzyme Polymerase.