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The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences
The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences
admin
2005-11-28
109
问题
The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences in their resistance. The tubercle bacillus is one of the more resistant, and vibrio bacterium is one of the more sensitive to drying. In general, the encapsulated organisms are more resistant than the non-encapsulated forms. Spores are quite resistant to drying; the spores of the anthrax bacillus, for example, will germinate alter remaining in a dry condition for years or more. The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection, for the length of time that a droplet remains infective is a result, primarily, of the resistance of the particular microorganism to drying.
Tuberculosis is highly infections because______.
选项
A、spores are resistant to drying
B、the causative organism is encapsulated
C、droplets of sputum remain infective for a long time due to the resistance of the organisms to drying
D、none of these
答案
C
解析
本题可参照文章最后一句“The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection,for the length of time that a droplet remains infective is a result,primarily, of the resistance of the particular microorganism to drying.”据此可知,上呼吸道感染细菌在干燥空气中存活的时间长是导致其具有极强的传染性的原因。因此C项正确。
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0
考博英语
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