Which enzyme modified by genetic engineering is used as a 'clot buster'?

Streptokinase

The correct answer is Option (3) → Streptokinase 

Streptokinase, produced by the bacterium Streptococcus and genetically modified, serves as a "clot buster" in the removal of blood clots from the vessels of individuals who have experienced a heart attack.

The bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Pectinase is a class of enzyme which is used to break down pectin. 

Microbes are used for production of enzymes. Lipases are used in detergent formulations and are helpful in removing oily stains from the laundry.    

Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol.