试题与答案

微生物与人类关系密切。虽然有些微生物能使动植物患病,但多数微生物对人类是有益的。

题型:填空题

题目:

微生物与人类关系密切。虽然有些微生物能使动植物患病,但多数微生物对人类是有益的。请回答下列问题。

(1)培养微生物的培养基配方中一般含有水、碳源、氮源和无机盐。从土壤中分离分解尿素的细菌时,培养基中加的唯一氮源为___________,这种培养基称为_________培养基。

(2)在制备牛肉膏蛋白胨固体培养基的倒平板操作时,平板冷凝后,为什么要将平板倒置?________________________________。

(3)微生物接种的方法很多,最常用的是平板划线法和法。在用平板划线法接种时,为什么在操作的第一步以及每次划线之前都要灼烧接种环?_____________________。在划线操作结束时,仍然需要灼烧接种环吗?为什么?____________。

答案:

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参考答案:电气装置;电器具

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