在光学显微镜下观察植物细胞，不能看到的细胞结构是[]A．细胞壁B．细胞膜C．细胞质D．液泡-七年级生物

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• 制作洋葱表皮细胞临时装片的正确顺序是[]A．撕取内表皮、滴清水、染色、盖盖玻片B．撕取内表皮、滴清水、放置材料、盖盖玻片、染色C．滴清水、撕取内表皮、放置材料、染色、盖盖-七年级生物
• 菠菜放在开水里煮过后水的颜色变绿，而放在冷水中则不产生这种现象，原因是[]A．煮过后，绿色从细胞壁上褪了下来B．叶绿素溶解于热水而不溶解于冷水C．细胞质受热后产生绿色D．细-七年级生物
• 植物细胞既可以________，也可以________，这主要取决于细胞________水溶液的浓度和________浓度的大小。当周围水溶液的浓度________细胞液浓度时，细胞就失水；当细胞液浓
• 用盐拌黄瓜，黄瓜会出现________现象，若把已经________的黄瓜再放入清水中，则黄瓜又________，前者说明植物细胞可以________，后者说明植物细胞可以________。-七年级生
• 阅读理解。Here's the content (目录) of a book. 1. If you're interested in music, you can read &qu
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• 将菠菜泡在开水中，开水会变绿，而把菠菜泡在冷水中，水不会变绿，这是因为开水破坏了细胞的[]A．细胞壁B．细胞膜C．细胞质D．细胞核-八年级生物
• 紫菜的叶绿体中，除含有叶绿素外，还含有大量的[]A．胡萝卜素B．叶黄素C．藻红素D．藻黄素-八年级生物
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• A．细胞壁①控制物质进出B．细胞膜②遗传的控制中心C．液泡③支持保护作用D．细胞核④光合作用场所E．叶绿体⑤内含细胞液-八年级生物
• 下图是菠菜叶肉细胞的模式图。当我们研磨菠菜叶时，会发现有许多绿色的汁液流出。这些汁液主要来自图中的[]A．1B．3C．5D．6-八年级生物
• 探究与实践题某同学在做西红柿果肉细胞临时装片时，他发现以下问题，请你帮助他分析、解决一下。(1)在观察的过程中，视野忽明忽暗。________________________(2)他挑取了少量-七年级
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• 细胞是生物体结构和功能的基本单位，是一个植物细胞模式图。请据图回答以下问题：（1）细胞中的遗传信息库是__________。（2）能够控制物质进出细胞的结构是_________。（3）植物进-七年级生
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• 先阅读短文，掌握其大意，然后从方框中所给的词中选出最恰当的10个，并用其适当形式填空，每个次限用一次。leafthen large learn ones grow thick hasmeanfirst
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• 制作洋葱鳞片叶表皮细胞的临时装片时，染色的正确方法是[]A．先将碘液滴在载玻片中央，再将洋葱表皮放入并展平B．先盖盖玻片，再将碘液滴在盖玻片一侧，另一侧用吸水纸吸C．将洋-七年级生物
• 在显微镜下观察用碘液染色的洋葱表皮细胞时，细胞染色最深的结构是[]A．细胞壁B．细胞膜C．细胞核D．细胞质-七年级生物
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• 将名词与相应的功能对应起来。1．循环系统a．保护内部柔嫩部分2．细胞膜b．使光能变成化学能3．叶绿体c．控制物质进出4．上皮组织d．运输体内物质5．分生组织e．运输水和无机盐6．输导组-七年级生物
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