HINT FOR NEXT TIME: The regulatory gene codes for a regulatory protein, which is capable of binding with DNA. Find the protein that binds with DNA, and work backwards from there.
The number for RNA polymerase
Correct! “It’s 4.
HINT FOR NEXT TIME: RNA polymerase is a protein, and it binds with DNA. So find something that is not a double helix, but which binds with the double helix, and you’ll be on your way to the answer.
The number of the promoter region
Excellent! ”5″ represents the promoter.
HINT FOR NEXT TIME: The promoter region is where RNA polymerase binds.
The number for the operator region.
Fantastic. “6” is the operator region.
HINT FOR NEXT TIME: The operator region is where the regulatory protein binds. When that protein binds, it blocks RNA polymerase.
The regulatory protein
Great! The regulatory protein is “3.”
HINT FOR NEXT TIME: The regulatory protein is transcribed and translated from the regulatory genes, and it binds with the operator region, blocking RNA polymerase.
The structural genes
Nice! The structural genes are at ”7.”
HINT FOR NEXT TIME: The structural genes are downstream from the operator.
The number or letter that represents transcription of the regulatory genes.
Nice going! Letter “a” represents transcription of the regulatory genes.
HINT FOR NEXT TIME: Transcription makes DNA into RNA. Where is that happening?
To create the regulatory protein, a ribosome would be required at this point.
Yes! A ribosome would be required at “b” to transform the regulatory gene’s RNA into protein.
HINT FOR NEXT TIME: Ribosomes are required for protein synthesis. Find the regulatory protein, and work backwards to see where protein synthesis would happen.
The number of the protein that transcribes the operon’s DNA into RNA.
Thumbs up! It’s RNA polymerase (at “4”).
HINT FOR NEXT TIME: It’s RNA polymerase.
The number for the catalytic proteins that synthesize tryptophan.
Superb. The proteins are enzyems, and they’re shown at “ 9.”
HINT FOR NEXT TIME: What’s another name for a catalytic protein?
If the repressor binds with this region, the genes won’t be transcribed.
Outstanding! It’s the operator, at “6.”
HINT FOR NEXT TIME: You’re looking for the operator, which is downstream of the promoter.