Question

One of your skin cells is about to replicate its DNA. What happens first?

Question 2 options:

RNA enters the nucleus from the cytoplasm to be copied.


The ribosome attaches to the DNA.


The helicase enzyme unwind the DNA molecule into two strands.


An RNA molecule attaches to a DNA molecule.

Answer 1

The correct option is C) The helicase enzyme unwind the DNA molecule into two strands.

Step-by-step explanation:

DNA replication occurs in a semi-conservative manner. This means that each strand of the DNA can give rise to a new strand. For the process of DNA replication to begin, firstly it is necessary that the DNA unwinds. Topoisomerases are enzymes which are known to remove the super-coiling of the DNA. Helicases can be described as the enzymes which separate the two strands of DNA from the region where replication has to begin. Hence, option C is correct.