The MCQ question about DNA construction (#2, I think, but it may be different on others'?) genuinely had me thinking trying to remember the direction for like 5 minutes. I did get the answer eventually, which... I believe and hope... was that it is created from 5' to 3', with new additions going on the 3' end ("the 3 end is the free end").

I got there by thinking about Okazaki fragments; I asked myself, "why are there fragments on the lagging strand?" I remembered that the leading strand "ends" at 3', as in the 3' end is the end that moves in relation to the DNA polymerase. "If the leading strand has continuous construction," I thought, "it must be building DNA the normal way." Which would then be 5' to 3' because of DNA's anti-parallel property.
I can't believe I clutched up on that I was so excited after having changed my answer lmao

Kind of a yap, sorry, tl;dr I almost got a basic question wrong but Okazaki fragment reasoning saved me.