Answer:
Like the lac operon, the trp operon is a negative control mechanism. The lac operon responds to an inducer that causes the repressor to dissociate from the operator, derepressing the operon. The trp operon responds to a repressor protein that binds to two molecules of tryptophan.
The answer is C respond to stimuli in the environment
Answer:
They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.
Explanation:
Matter refers to the particle which has inertia and takes up physical space. As per modern physics, the matter is made up of different types of particulates, each with its mass and size. elements are consist of only one type of atom and can exist as either atoms or molecules whereas compound is incorporated of two or more different elements that are bound together, chemically. As per the question silver is an element while others are examples of compounds and they both belong to the category of matter.
Answer:
b. a person has an emotional need for a drug
