Answer:
most common samples used today Blood and Hair
Answer: C
Explanation:
For example, in trp-operon, an abundance of tryptophan. coli inhibits the expression trp-operon genes.
Trp operon is a negative repressible feedback mechanism
trpR gene is expressed continually at a low level
Because it creates energy and food for different beings
ummm
i cant answer that question because you didn't give me the species type or what the species is