Question 15 : Atmospheric nitrogen is directly useable by most organisms but has to be converted to stable organic form such as ____. I. Ammonium II. Ammonia III. Nitrate
I and III
I, II and III
Question 16 : The vaccine for the disease anthrax was developed between the period __
1860 - 1870
1880 - 1890
1890 - 1900
Question 17 : The following are external structure of a bacterial cell wall except ____.
Spores and cysts
Question 18 : The following are types of asexual spores in fungi except ____.
Question 19 : When a culture of microorganisms is transferred from a nutritionally poor medium to a richer one,____ occurs.
Question 20 : Who pioneered the use of enrichment cultures and selective media?
Behring and Kitasato
Jenner and Kitasto
Beijerink and Winogradtsky
Jenner and Behring
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