Select the correct pair of microorganism and the product obtained from it.

(1) Monascus purpureus - produces large holes in Swiss cheese.

(2) Saccharomyces cerevisiae - used for making wine and beer after distillation

(3) Streptococuss-produces streptokinase which is used to remove clots.

(4) Aspergillus niger - produces citric acid and butyric acid.

Which antibiotic has bactericidal effect?

(1) Erythromycin

(2) Penicillin

(3) Both 1 and 2

(4) None of these

Wine and beer are produced directly by fermentation whereas brandy and whisky require both fermentation and distillation. This is because

(1) fermentation is inhibited at an alcohol level of 10-18%

(2) distillation prolongs storage

(3) distillation improves quality

(4) distillation purifies the beverage

Select the incorrect match

(1) Citric acid - Aspergillus niger

(2) Streptokinase - Streptococcus

(3) Butyric acid - Clostridium acetobutylicum

(4) Cyclosporin-A - Monascus purpures

Which of the following antibiotics is not correctly matched with the source from which it is obtained ?

The preparation and flowering of leaves of tea and tobacco is due to the activities of 

(1) Bacillus subtilis

(2) Bacillus megatherium

(3) Streptococcus lactis

(4) Acetobacter aceti

The antibiotics have no effect on viruses because

a.   viruses show the metabolism of their own

b.   viruses are too small in size for antibiotics to act upon them

c.   viruses show no metabolism of their own

d.    viruses produce a thick covering and encyst themselves as endospores

The domestic sewage in large cities

(1) has a high BOD as it contains both aerobic and bacteria

(2) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment plants (STPs)

(3) when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen

(4) has very high amounts of suspended solids and dissolved salts

Which one of the following useful organisms is not a part in production of curd/yoghurt?

(1) S. thermophilus

(2) Lactobacillus bulgaricus

(3) Acetobactor aceti

(4) Streptococcus lactis

Which one is used/regarded as a biofertilizer?

1. An association between pteridophytes and cyanobacteria Anabaena

2. An association between gymnosperms and Nostoc

3. An association between legume and Rhizobium

4. All of the above