Select the correct answer from each drop-down menu.
The trp operon in E. coli regulates genes that code for enzymes required for synthesis of the amino acid tryptophan. The trp operon is a
repressible operon. When tryptophan is not available in the environment, the trp repressor protein is
. Therefore, RNA
polymerase can bind to the
to begin transcription.

9. the history of life on earth is recorded in

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!

Which of these definitions have been paired with the correct type of cell?