This is a working model of one real bacterial gene, 24 bases long. Copy it, read it out as mRNA, and build the protein it codes for, one step at a time. Then switch on an antibiotic and watch the step it jams stop dead.
Replication press Step or Play
What you are looking at. Purple strands are the original DNA. Green is brand new DNA. Gold is mRNA. Blue circles are amino acids in the growing protein chain.