Which of the following statements are true for enzymes?

(i) Almost all enzymes are proteins.

(ii) There are some nucleic acids that behave like enzymes, these are called ribozymes.

(iii) Enzymes are not damaged above 40 o C.

(iv) Enzymes isolated from thermophilic organisms are working up to 80-90 o C.

(v) The enzymes has accelerated the reaction rate by about 10 million times.

(vi) A multistep chemical reaction, when each of the steps is catalyzed by the same enzyme complex or different enzymes, is called a chemical reaction path.