Biology 9th Edition by Eldra Solomon,Linda Berg ,Diana Martin

تمرين 5

ANALYZING DATA. Develop a simple hypothesis that would explain the behavior of each of the following types of mutants in E. coli:
Mutant a: The map position of this mutation is in the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if large amounts of tryptophan are present in the growth medium.
Mutant b: The map position of this mutation is in the trp operon. The mutant cells do not produce any enzymes coded for by the trp operon under any conditions.
Mutant c: The map position of this mutation is some distance from the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if the growth medium contains large amounts of tryptophan.