<span>The operon binds to the RNA polymerase and releases the repressor.</span><span>
Amino acids like tryptophan and tyrosine are used to produce neurotransmitters and other products. Hormones such a serotonin and melatonin are made products of tryptophan as well as norepinephrine and adrenalin.</span>
The best way for adolescent to build and protect his or her bones is to ingest food products that are rich in calcium for it is known to make bones stronger. Another way is to be able to do exercise as a daily routine so that the bones are exercised every day to prevent bone disease, this will stenghten the bones and make them more stronger.
The correct answer is C A single-celled protist divides into two cells, and each one becomes another protist.
