Problem: Certain vitamins function as coenzymes in the body. Which of the following are true statements about coenzymes? Need Assignment Help? Check All That Apply Proteins are activated by coenzymes.Proteins are activated by coenzymes. Thiamin, niacin, riboflavin, and pantothenic acid are vitamins that function as coenzymes.Thiamin, niacin, riboflavin, and pantothenic acid are vitamins that function as coenzymes. An enzyme is activated when a coenzyme binds to it. An enzyme is activated when a coenzyme binds to it. Vitamins D and K play a major role as coenzymes in energy metabolism.Vitamins D and K play a major role as coenzymes in energy metabolism.