Petri plate is made by adding _____ into nutrient broth, dissolving it at 100℃ and poured into Petri dishes to solidify at 40 ℃ .
A. 0.5% agar;
B. 4% agar;
C. 2% agar
D. 0.1% agar
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Which special structure can be identified on Semisolid media?
A. Capsule
B. flagellum.
C. pili;
D. endospore
Which statement about colony is not right?
Almost all organisms within the colony are genetically identical
B. One colony is grown by several bacterial cells;
C. One colony is grown by only one bacterial cell;
D. Solid medium is used to support growth of colony.
A pure culture is usually obtained by transferring ____into a tube of new, sterile broth for further cultivation.
A. one bacterial colony on the agar plate;
B. Two different bacterial colonies on the agar plate;
C. Two same bacterialcolonies on the agar plate;
D. several colonies on the agar plate;
What metabolites of bacteria could be harmful to human being?
A. toxins;
B. antibiotics:
C. Pyrogen;
D. invasive enzymes;
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