The graph showing the concept of activation energy of enzyme is given below. Observe the graph and choose the correct option for M and N.

| Column I | Column II | ||
| i. | Cyclosporin - A | a. | Clot busters |
| ii. | Streptokinase | b. | Antibiotic |
| iii. | Statins | c. | Immuno supressive agent |
| iv. | Penicillin | d. | Blood cholesterol lowering agent |
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2
There are several valuable microorganisms that are beneficial to humans in various manners such as: