Examine the events that occur in DNA replication listed below.

A. DNA polymerase adds nucleotides floating freely in the nucleus to the template strands.

B. DNA helicase unwinds a DNA molecule.

C. Two DNA molecules form.

D. Two single strands of DNA are left with their bases exposed.

What is the correct order of the events?

C, B, A, D

D, C, A, B

B, A, C, D

B, D, A, C

The correct sequence is B, D, A, C

Explanation: During DNA replication, first, the enzyme helicase unwinds the double-stranded DNA molecule, creating two separate single strands with their bases exposed.

The two single strands each serves as a template for the synthesis of a new strand and the enzyme DNA polymerase then adds free nucleotides that are available in the nucleus to the primer to form new complementary strands. This results in two identical copies of DNA molecules.