What are small-interfering RNAs (siRNAs)? What is the function of siRNA?
a) siRNAs are long coding RNAs; they activate gene expression
b) siRNAs are short non-coding RNAs; they degrade mRNA
c) siRNAs are involved in translation; they bind to ribosomes
d) siRNAs are structural RNAs; they form the cell membrane