複選題25. This year's Nobel Prize in Physiology or Medicine was awarded for the discovery of microRNAs. Which of the following descriptions about microRNAs is (are) CORRECT? (A) MicroRNAs were first discovered in human cells. (B) The sequences of microRNAs are encoded in the genome. (C) MicroRNAs are important for modulating the RNA population in a cell; however, they are not required during embryonic development. (D) The amount of microRNAs in the cell can be regulated by circular RNAs, known as microRNA sponges. (E) The essential cytoplasmic ribonuclease for microRNA maturation is Drosha.