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> 某研究性学习小组利用图1所示实验装置探究酵母菌能否进行无氧呼吸,操作如下:配制5%的葡萄糖溶液20mL,经煮沸冷却后注入装置中的锥形瓶中,向瓶中加入适量的酵母菌培养液,最-高三生物
某研究性学习小组利用图1所示实验装置探究酵母菌能否进行无氧呼吸,操作如下:配制5%的葡萄糖溶液20mL,经煮沸冷却后注入装置中的锥形瓶中,向瓶中加入适量的酵母菌培养液,最-高三生物
题目简介
某研究性学习小组利用图1所示实验装置探究酵母菌能否进行无氧呼吸,操作如下:配制5%的葡萄糖溶液20mL,经煮沸冷却后注入装置中的锥形瓶中,向瓶中加入适量的酵母菌培养液,最-高三生物
题目详情
某研究性学习小组利用图1所示实验装置探究酵母菌能否进行无氧呼吸,操作如下:配制5%的葡萄糖溶液20mL,经煮沸冷却后注入装置中的锥形瓶中,向瓶中加入适量的酵母菌培养液,最后以石蜡油封住瓶中液面。连接锥形瓶与装有BTB溶液的锥形瓶,将装置置于适宜条件下,观察BTB溶液的颜色及培养液的温度变化。(注:BTB溶液在CO
2
浓度为0.03%时呈红色,当CO
2
浓度大于0.03%时呈黄色,小于0.03%时呈紫色)请回答下列问题:
(1)研究小组首先将干酵母加入20mL5%的葡萄糖溶液中进行活化培养,图2是酵母菌活化过程中种群数量变化曲线图,实验中最好选择图2中________点时的酵母菌作为材料,主要原因是__________。
(2)实验中将葡萄糖溶液进行煮沸的目的是________和________。
(3)为了排除环境因素对实验结果的影响,还应该设计对照实验,对照实验与上述实验的主要区别是_________。
(4)经过一段时间后,对照实验中的BTB溶液仍然保持红色,实验组中的BTB溶液颜色变化为_______,为了进一步确认酵母菌进行了无氧呼吸,还需检测培养液中是否有_________产生。
题型:实验题
难度:中档
来源:模拟题
答案
(1)b 此时酵母菌繁殖速度快,代谢旺盛
(2)去除溶液中的空气 杀灭溶液中的微生物
(3)以加热杀死的等量酵母菌代替活酵母菌或锥形瓶中不加酵母菌
(4)红色转变为黄色 酒精
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题目简介
某研究性学习小组利用图1所示实验装置探究酵母菌能否进行无氧呼吸,操作如下:配制5%的葡萄糖溶液20mL,经煮沸冷却后注入装置中的锥形瓶中,向瓶中加入适量的酵母菌培养液,最-高三生物
题目详情
(2)实验中将葡萄糖溶液进行煮沸的目的是________和________。
(3)为了排除环境因素对实验结果的影响,还应该设计对照实验,对照实验与上述实验的主要区别是_________。
(4)经过一段时间后,对照实验中的BTB溶液仍然保持红色,实验组中的BTB溶液颜色变化为_______,为了进一步确认酵母菌进行了无氧呼吸,还需检测培养液中是否有_________产生。
答案
(2)去除溶液中的空气 杀灭溶液中的微生物
(3)以加热杀死的等量酵母菌代替活酵母菌或锥形瓶中不加酵母菌
(4)红色转变为黄色 酒精