Without those nucleotides, it will not be able to build our structure in the same way that we cannot build a building without the bricks, the building blocks. Let's move on to B. So, DNA polymerase requires a template DNA strand and that's because it's the template DNA strand that essentially provides the blueprint, the instructions to build that replicated strand of DNA. And this is analogous to the following scenario. So let's suppose we have a construction worker and the construction worker has to build a building. Now the construction worker cannot build that building without having the blueprint that was created by the architect.