Which of the following is FALSE?   Question 3 options: A Some bacteria reduce nitrate to nitrite B Some bacteria reduce nitrite to ammonia and/ or nitrogen gas C Sukfanilic acid and alpha- naphthylamine are used to detect if nitrites are present D A clear result after adding reagent A and B is negative for nitrate reduction E A clear result after adding zinc is a positive result for nitrate reduction

Sweet sorghum juice is used as sole carbon source for ethanol production by Saccharomyces cerevisiae. The overall in situ sterilisation duration is 40 minutes at 120 0C for a pilot reactor (50 L) which is filled with 60% of working volume. The non-sterile medium consists of 3.28 x 106 contaminants L-1. During the autoclaving process, you have noticed that the time taken for heating and cooling are 18 minutes and 15 minutes, respectively. As a process engineer, explain if you agree with this sterilisation practice by using quantitative analysis.

The arrowhead shaped zone shows what reaction? How do you set up the test for this reaction? For which organism is this an important test?

Which of the following indicates buffering in the titration given in the image below? 12 11 10 Point 1 Point 2 8 7 pH Region 1 Region 2 6 4 3 Cocoo 2 + + + + + 10 15 20 25 30 35 40 45 50 ml of 0.1MHCI