What is ribozyme?

Enzymes consist of a protein part and a prosthetic group connected by weak bonds. During activity,these weak bonds are separated. This process is known as:

Enzyme + Substrate $\rightarrow$ $?$ $\rightarrow$ Enzyme + Product

Which of the following correctly represents the given graph?

The enzyme that catalyzes the addition of molecular oxygen is:

Which of the following statements is correct regarding enzymes?