During transcription an RNA copy of a gene is made in the nucleus.
- Hydrogen bonds between the 2 DNA strands in a gene break and the DNA molecule uncoils.
- One of the strands is then used as a template to make mRNA. The template strand is called the antisense strand.
- mRNA is a single polynucleotide
- RNA is an exact reverse copy of the antisense strand except T is replaced with U.
- Free RNA mononucleotides line up along the template strand. Once they have paired up with their complementary bases they form an mRNA molecule.
- The mRNA moves out of the nucleus through a nuclear pore and attaches to a ribosome in the cytoplasm.
- When enough mRNA has been produced the hydrogen bonds reform and the strands coil back into a double helix.
Translation occurs at the ribosomes in the…