An apoenzyme requires a cofactor for its activity. is an enzyme consisting of RNA rather than protein. always requires an inorganic ion for its activity. is the nonprotein component of a holoenzyme.

Coenzyme.

Explanation:

Enzymes are known as proteins which help to catalyze the biochemical reaction. The enzyme consists of a protein part that is not active is called an apoenzyme. It gets activated by the addition of an inorganic or organic Cofactor. The holoenzyme is known as an apoenzyme in combination with the Cofactor.

A Cofactor is known as a non-protein part consisting of the enzymes, which can be an organic chemical or metal ions. The cofactors which are organic chemicals are known as Coenzyme. These are loosely attached to the apoenzyme. The tightly bound Coenzymes are known as the prosthetic group.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus