Small interfering rna, also known as rnai, is single-stranded rna that binds to mrna with a rna-induced silencing complex protein. according to the model, what is the most likely effect of rnai on the expression of the mrna? a) rnai degrades the mrna, preventing its translation. b) rnai increases the transcription of the target gene. c) rnai increases the translation of the specified mrna. d) rnai degrades the protein, preventing its phenotypic expression.