Enzyme

is a macromolecule that acts as a catalyst, a chemical agent that speeds up a reaction without being consumed by the reaction.

it is the S̲i̲t̲e̲ of an enzyme where substrate binds

is typically a pocket or groove on the surface of the enzyme where catalysis occurs.

-brings chemical groups of the active site into positions that enhance their ability to catalyze the chemical reaction

• - the active site can change its shape to bind the substrate

Answer explanation

the term used to describe any case in which a protein’s function at one site is affected by the binding of a regulatory molecule to a separate site

do not directly compete with the substrate to bind to the enzyme at the active site.

- resemble the normal substrate molecule and compete for admission into the active site.

Each enzyme has an optimal temperature at which its reaction rate is greatest

Above that temperature, however, the speed of the enzymatic reaction drops sharply

and the enzymes becomes

Nonprotein helpers for catalytic activity

may be bound tightly to the enzyme as permanent residents, or they may bind loosely and reversibly along with the substrate