What happens when the substrate molecule binds at the active site of the
enzyme?
the substrate molecule becomes stressed, which allows the reaction to occur.
the product molecule becomes stressed, which allows the reaction to occur.
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the enzyme molecule becomes stressed, which allows the reaction occur.

cancer   is   essentially   uncontrolled   mitosis   of specialized cells

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.