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The primary transcript is larger then the mRNA.
How does a primary transcript differ from an mRNA?
The key difference between pre-mRNA and mRNA is that pre-mRNA is the first product of the transcribed gene and contains both non-coding sequences (introns) and coding sequences (exons) while mRNA is the second product of a transcribed gene which contains only coding sequences.
Gene is the functional unit of heredity. It is a specific DNA segment comprising of the genetic code to manufacture a protein. Genes undergo a two-step process called gene expression. Transcription is the first step in which the DNA sequence converts into an mRNA sequence. Translation is the second step in which the mRNA sequence converts into an amino acid sequence. During the transcription, DNA sequence first converts into a pre-mRNA molecule which is the primary transcript containing both coding and non-coding sequences. Pre-mRNA molecule produces the mRNA (messenger RNA) molecule after undergoing RNA splicing or processing. mRNA sequence contains only coding sequences.
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