Micro RNA mimics and negative control mimics?

Mimicking simply means to copy. If you want to mimic someone do exactly what they do. Children are especially good at this!

someone that copies someone else ----

Yes. You need to go and see your doctor about this because it may be that these particular birth control pills are reacting badly with your body and you need some different ones

atay sa nangutana oy bagay bati-a ninyo nalong oy

Well, mimic people. If you want to know what mimic means, it means mock; imitate; copy.