inside a prokaryote, such as e. coli, an operon controls for the production of the amino acid tryptophan. what occurs in the cell in order to turn off the production of tryptophan?

tryptophan binds with the promoter to block the dna polymerase.
the operon binds to the rna polymerase and releases the repressor.
tryptophan binds with the repressor, allowing it to attach to the operator site, blocking rna polymerase.
the rna polymerase binds to the tryptophan, activating the repressor, blocking the promoter.

After frida stops exercising, she continues to breathe heavily. what is most likely occurring in her body? heavy breathing during exercise has produced an oxygen surplus in her muscles. this oxygen is being transported to her lungs. this is a result of aerobic respiration. heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. lactate is being transported to her liver. this is a result of aerobic respiration. strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration. strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration.