Why is it that a different enzyme cannot be used on just any organic compound? explain.

This is due to the characteristic of specificity of the enzyme. Enzymes have active sites that only bind particular substrates which they catalyze. This is because the shape of the active site is complementary to that of the substrate  (like lock and key).

answer; ///(b) it is composed of four protein chains and four heme groups;

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.