A virus is a tiny infectious（）
A. cell
B. living thing
C. particle
D. nucleic acid
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Which one is the world largest known bacterium（）
A. Epulopiscium fishelsoni
B. Escherichia coli
C. Bacillus subtilis
D. Thiomargarita namibiensis
All phototacfic bacteria respond to light by（）
A. moving away from the source of light
B. moving toward the source of light
C. increasing the movement of their flagella
D. creating gas vesicles to rise to the surface
Who firstly invented micorscope and oberserved bacteria（）
A. Robert Koch
B. Louis Pasture
C. Antony van Leeuwenhock
D. Alexander Fleming
Microorganisms are divided into（）
A. Bacteria
B. Archaea
C. Fungi and protists
D. Viruses and other molacular organisms
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