Answer:
The correct answer is b The regulator gene falls off the operator and the structural genes get transcribed.
Explanation:
Tryptophan operon contain3 regulatory genes and 5 structural genes.when adequate amount of tryptophan is present at that time the tryptophan binds to the repressor molecule encoded by tryp R gene.Thus Tryptophan act as co repressor .The repressor molecule bound to tryptophan interacts with operator region resulting in blocking the expression of structural genes.
But when tryptophan is absent at that time repressor molecule cannot function.As a result the repressor molecule fall off from the operator and structural genes get transcribed.
The statement 2+2=4 would be considered a LAW in the science world
Raynaud's disease is the answer
According to the American College of Sports Medicine and the Academy of Nutrition and Dietetics, an endurance athlete should have a daily protein consumption of at most 2 grams per kilogram of his or her body weight. If the endurance athlete weighs 60 kilograms, then you should consume 120 grams of protein per day.