22.Identify the single most correct answer: (a) Ames assay (test) can be used to identify carcinogens but not mutagens. b) Conjugation in viruses can result in production of an antibiotic resistant virus. c) Certain groups of viruses are responsible for the process of transduction in bacteria. d) Organisms in their natural environment cannot exchange genetic information. e) c and d
22.Identify the single most correct answer:
(a) Ames assay (test) can be used to identify carcinogens but not mutagens.
b) Conjugation in viruses can result in production of an antibiotic resistant virus.
c) Certain groups of viruses are responsible for the process of transduction in bacteria.
d) Organisms in their natural environment cannot exchange genetic information.
e) c and d
24.
In a use-dilution test, for microorganism X, we evaluated 3 different disinfectants T1, T2 and T3 with the following disinfectant dilutions: 1/10, 1/100, 1/1,000 and 1/10,000. T1 killed the microorganism up to the dilution of 1/100; T2 killed the microorganisms up to the dilution of 1/10,000 and T3 killed the microorganisms up to the dilution of 1/1,000. Rank the disinfectants in the order of their strength with the strongest being first, for disinfecting contaminations with microorganism Xor alternatively are they all equally effective? Choose the most correct answer.
a) T1 (the strongest), T2, T3
b) T1 (the strongest), T3, T2
( c) T2 (the strongest), T3, T1
d) They are all equally strong to disinfect contaminations with microorganism
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