Protein Synthesis: Transcription and Translation
For this information go to page 300 in our textbook.
Transcription is the process in which DNA makes mRNA by dividing and matching the bases replacing thymine with uracil.

Translation is the process in which the mRNA travels to the ribosomes in the cell where tRNA matches up with it to form proteins eventually ending with the connection of proteins in a polypeptide chain. Watch the following video to watch protein synthesis occur in a cell.



Notice how the mRNA is only a single strand coming out of the nucleus unlike DNA which is a double strand in a double helix shape.

The enzyme you see unzipping the DNA and making a new mRNA strand is RNA polymerase.

Also pay attention to the green strand of amino acids coming out of the ribosome, this is the polypeptide chain.

Here is a still image of protein synthesis to help you better understand what is occuring. Notice that the upper left hand corner is the nucleus where transcription is occuring and at the bottom right hand corner is the ribosome where translation is occuring.
external image protein_synthesis.gif