Question

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32. The percentage of microorganisms that are cultivable is estimated to be a) 85-100% b) <5% c) 10-20% d) 50-85% 33. The transmission of which category of water-associated diseases requires a water-based intermediate host? a) Water-borne b) Water-based c) Water washed d) Acquaphilic 34. Methanogens are a) CHe-consuming bacteria b) CHe-producing bacteria c) CH-consuming archaea d) CH-producing archaea 35. In wastewater management, black water refers to a) faecal/urine/toilet flushing water only b) food preparation and personal washing water c) industrial wastewater d) flood water 36. Bacterial cells are typically a) 1-10 um in size b) 10-100 mm in size c) 1-10 nm in size d) 100-1000 um in size 37. What is a virus? a) A disease causing bacterium b) An encapsulated piece of DNA or RNA c) A prion d) A prokaryote 38. The term "plasmid" describes a a) microscopic animal b) ONA molecule that can replicate independently of the chromosomal DNA c) cluster of antibiotic resistance genes d) surface to which molecules, such as proteins, can attach 39. Gram staining is based on a) the ability of the bacterial cell wail to retain crystal violet dye b) the lysis of bacterial cells c) differences in bacterial shape and size d) growth of bacterial cells PTO

Answer 1

32)b less than 5( 2%)

33) b water based- requires intermediate host.

34)d methane producing archaea

35)a urine ,rascal, toilet flushing water.

36) a 1-10 micrometers in size

37) b it has either DNA or RNA

38)b plasmid is extra chromosomal DNA it can replicate on its own.

39) a Gram staining is based on the ability of bacteria cell wall to retain the crystal violet dye