Does an enzyme cause the red coloration of an apple?

No, an enzyme does not cause the red coloration of an apple. The red color in apples is caused by anthocyanins, which are pigments that reflect red, purple, and blue light. These pigments are found in the skin of the apple and are not produced by enzymes. However, the synthesis of anthocyanins can be influenced by enzymes. For example, the enzyme anthocyanidin synthase is involved in the final steps of anthocyanin biosynthesis. But it's important to note that the enzyme itself does not cause the red coloration.