The fastest acting enzyme in the biological world is ......... .

Riboflavin and Renin are respectively .....

Zymogens are

Study the following statements:
$(a)$ The substrate binds to the active site of the enzyme.
$(b)$ Enzymes isolated from thermophilic organisms get denatured at $50^{\circ}C$.
$(c)$ The active site of the enzyme breaks the chemical bonds of the product.
$(d)$ Prosthetic groups are tightly bound to the apoenzyme.
Select the option which includes all correct statements:

An average living cell contains about:

The nucleic acids are broken into nucleotides by .......... enzymes.