Stuttering is a speech disorder characterized by repetition of sounds, syllables, or words; prolongation of sounds; and interruptions in speech known as blocks. An individual who stutters exactly knows what he or she would like to say but has trouble producing a normal flow of speech.
The 3 types of RNA are mRNA is a long strand, the tRNA is shaped  like a clover leaf pattern. The third shape is Ribosomal RNA, it  is a very complex shape.
The three primary types of RNA molecules are messenger RNA, transfer RNA and ribosomal RNA. 1  Messenger RNA (mRNA) plays an important role in the transcription of DNA. 2  Transfer RNA (tRNA) plays an important role in the translation portion of protein synthesis. 3  Ribosomal RNA (rRNA) is a component of cell organelles called ribosomes.