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.
After watching this lesson, you should be able to: 1  Compare and contrast the structures of DNA and RNA. 2  Define the central dogma. 3  Explain the function of RNA and its different types: mRNA, rRNA, and tRNA. 4  Summarize why RNA is less stable than DNA.