Which of these is true? argonaute protein null mutants will be defective in translational inhibition but will be able to combat viruses o only one of the sirna strands is biologically active o dicer mutants will lack all types of small rnas, including long circular rnas o preventing transposon mrna cleavage will have no effect on the heterochromatization of its genomic locus o if there is a mutation that renders ago catalytically dead (it cannot cut rna), adding extra dicer protein would rescue the ago mutant phenotypes, because dicer also cuts mrna.