Indicate whether each of the following descriptions better matches miRNAs (M) or siRNAs (S) in animal cells. Your answer would be a four-letter string composed of letters M and S only, e.g. MMMM.
( ) They usually cleave their target RNAs using the slicing activity of the Argonautes.
( ) They typically show perfect complementarity with their target RNA.
( ) They can bind to the RITS as well as the RISC complex.
( ) They seem to be the more ancient form of small noncoding RNAs.