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人教版高中生物教材必修3有探究“培养液中酵母菌种群数量的变化”实验,其中有这样的思考题:“从试管中吸出培养液进行计数之前,建议你将试管轻轻振荡几次。”这是为什么?答案很简单:防止培养液中的酵母菌分布不均匀。但是酵母菌在培养液中究竟是怎样分布的呢?上层多还是下层多?这个问题产生于学生,在教师之中也讨论过,始终存在2种看法:第1种看法认为酵母菌是兼性厌氧菌,在有氧和无氧的条件下都能生存。
People’s Education Edition of high school biology textbook compulsory 3 to explore “changes in the number of yeast culture in the liquid ” experiment, which has such questions: “from the tube aspiration culture medium count, it is recommended that you tube light Light oscillation a few times. ”Why is this? The answer is simple: to prevent the distribution of yeast in the culture medium uneven. However, what is the distribution of yeast in the culture medium? The upper or lower levels? This problem arises from the students, also discussed in the teacher, there are always two kinds of views: The first view that the yeast is facultative Anaerobic bacteria, in aerobic and anaerobic conditions can survive.