How is the cell in Diagram B effectively using its resources? A.)Since lactose is present, the repressor protein will begin transcription.

B.)RNA polymerase is transcribing the genes since lactose is present.

C.)The cell continually produces the enzymes needed to break down lactose.

D.)Since lactose is absent, the repressor protein is blocking the genes and stopping transcription.

Which of the following is a common response to cell signaling?

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.