a) Draw a simple scheme for a stirred tank bioreactor and show the main parts usually available in a bioreactor (3p) b) What is the definition of sterility and what is the best method for sterilization of gases (3p) c) Mention two applications of the microbial enzymes ( 1p) d) What are the main steps in process of conversion of waste to biogas? (2p) e) Give two examples of macro nutrients and micronutrients (2p) f) What mode of operation is suitable for production of antibiotics? Motivate your answer (2 p) g) What is the definition of fermentation in biochemistry? ( 2p )