题目内容

In which phase are the endospores produced by some bacteria?

A. lag,
B. stationary,
C. logarithmic,
D. death phase.

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Which of the following is not the cause of cell death at death phase?

A. production of antibiotics;
B. toxic metabolites accumulation.
C. autolytic enzymes;
D. the nutrients exhaustion;

Which statement is not right at log phase?

A. The growth of 2n;
B. DNA and protein syntheses are maximized.
C. The growth rate reaches a constant;
D. No toxic metabolites produced.

Which of the following term means a collection of nutrients can support growth of microbe?

A. culture;
B. medium;
C. inoculum
D. specimen

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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