During transcription, the primary product is messenger RNA (mRNA). This process involves the synthesis of a complementary RNA strand from a DNA template. Here's a brief overview of the steps involved:
1. **Initiation**: RNA polymerase binds to a specific region of the DNA called the promoter and unwinds the DNA strands.
2. **Elongation**: RNA polymerase moves along the DNA template strand, synthesizing the RNA transcript by adding ribonucleotides that are complementary to the DNA template strand (with uracil replacing thymine).
3. **Termination**: When RNA polymerase reaches a termination signal in the DNA, the synthesis of RNA is completed, and the newly formed mRNA strand is released.
The resulting mRNA molecule carries the genetic information from the DNA, which is then used in the process of translation to produce proteins. In eukaryotic cells, the mRNA may undergo further processing, such as splicing, capping, and polyadenylation, before it is translated.