Which of the following is an examThe 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 inactive
. Therefore, RNA polymerase can bind to the
to begin transcription.

ple of a beneficial mutation?

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.

C.25-28.. . .

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.