Which of the following enzymes become activated in the presence of $Mg^{++}$?

Which one of the following metallic ions does not occur as a prosthetic group in any enzyme?

The presence of $Zn$ is required for the activity of which enzyme?

What is the prosthetic group in the structure of an enzyme composed of?

Select the correct pair of $X$ and $Y$.
\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau\tau

Column $X$	Column $Y$
$(1)$ Phosphatase enzyme	$(P)$ Molybdenum
$(2)$ Tyrosinase	$(Q)$ Fat
$(3)$ Intestinal enzyme	$(R)$ Copper
$(4)$ Carbonic anhydrase	$(S)$ Manganese
$(5)$ Glucose phosphatase	$(T)$ Zinc

The cofactor for alcohol dehydrogenase is: