认真分析动、植物细胞的结构，你一定能发现动物细胞中所没有的结构是（）A．细胞壁B．细胞膜C．细胞质D．细胞核-生物

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• 如图分别为动物细胞（图一）和植物细胞（图二）结构示意图，请据图回答：（1）图一表示人体口腔上皮细胞，图二若要表示樟树叶的叶肉细胞，则缺少______（结构名称）；（2）若图一表示人-生物
• 下列细胞结构中，只有植物细胞才具有的结构是[]A．细胞核B．细胞质C．细胞壁D．细胞膜-八年级生物
• 小麦种子内储存的化学能来自太阳能，刚刚收获的小麦种子堆积贮存久了会发热，小麦种子中完成这两种能量转化的结构分别是[]A．细胞核；液泡B．叶绿体；线粒体C．细胞质；线粒体D-八年级生物
• 每种植物细胞通常都具有一定的形态，这主要是因为[]A．细胞壁的保护作用B．细胞膜的保护作用C．细胞壁的支持作用D．细胞膜的支持作用-七年级生物
• 请将下面的结构与功能用线连接起来。①细胞核a．动力车间②线粒体b．遗传信息库③叶绿体c．控制物质进出④细胞膜d．缓慢流动，加速物质交换⑤细胞质e．使光能转变成化学能-七年级生物
• 阅读理解 Will the world end in 2012? Many people believe the Mayan Calendar 2012 says so. But there is s
• 阅读下面短文，根据所给语境，按要求完成下列各题。 The first walk into outer space was taken by a Soviet astronaut. Astronaut
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• 下面两张图分别是哪类生物的细胞图，请你仔细辨别并回答有关问题：⑴图A表示___________细胞结构图，图B表示_____________细胞结构图；⑵A和B的区别是B没有__________、__
• 完形填空 Many animals use some kinds of "languages". They use signals (信号) and the signalshave
• 下面有关细胞的知识叙述中，错误的是（）A．植物细胞有细胞壁和液泡，动物细胞没有B．人的红细胞放在清水中，会吸水过多而涨破；洋葱根尖细胞则不会C．烟草叶片细胞中的尼古丁和柿-生物
• 植物的根毛细胞既能吸收土壤中的氮、磷、钾等营养物质，又能将其它不需要的物质挡在外面，这主要是由于[]A．细胞壁具有保护细胞的功能B．细胞膜具有保护细胞的功能C．液泡与吸水-八年级生物
• 用连线表示出下列细胞结构与功能的对应关系A．细胞膜①含有遗传物质B．细胞质②将光能转变为化学能C．细胞壁③控制物质进出D．细胞核④进行生命活动场所E．叶绿体⑤支持、保护作用-七年级生物
• 植物细胞进行呼吸作用的主要场所是[]A．叶绿体B．细胞核C．线粒体D．细胞壁-七年级生物
• 阅读下面短文，根据短文内容回答问题。 Whatisthehottesttopicatyourschool?InHangzhouYongjinMiddleSchool,it'smoney.Th
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• 下图是植物细胞和动物细胞的结构示意图，据图回答问题：（1）属于植物细胞的是__________图，你判断的依据是该细胞具有__________、_______和________；（写名称）图中B除了保
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• 下列结构中，动植物细胞都具有的是（）①细胞壁②细胞膜③细胞质④细胞核⑤叶绿体⑥线粒体⑦液泡．A．①②③④⑥B．②③④⑥C．③④⑤⑥D．①⑤⑥⑦-生物
• 切开熟透的西瓜时，有浅红色的汁液流出来，这些汁液主要来自[]A．细胞壁B．细胞膜C．细胞核D．液泡-八年级生物
• 人们在切食成熟的西瓜时流出的汁液是[]A．细胞质B．液泡C．细胞核D．细胞液-七年级生物
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• 丽丽穿的白裤子被鲜菠菜汁染上绿色，能将这一污迹除去的最佳材料是[]A．普通洗衣粉B．酒精C．沸水D．肥皂水-八年级生物
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• 请指出植物细胞结构简图中部分结构名称标号1是______，标号2是______，标号3是______，标号5是______．-生物
• 恩吉尔曼把载有水绵和好氧性细菌的临时装片放在无空气的黑暗环境里，用极细的光束照射水绵。显微观察发现，好氧性细菌只集中在叶绿体被光束照射到的部位附近；如将上述装片完-七年级生物
• 福桔的果肉酸甜可口，其酸甜的物质主要贮存在[]A．细胞壁B．液泡C．细胞核D．细胞膜-八年级生物
• 阅读理解。 Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freeze
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• 根据短文内容及所给首字母填写所缺单词 Many people find exams a frightening experience.Sitting down for an exam when eve
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• 西瓜之所以甘甜可口，主要是因为西瓜的下列哪项含有大量的糖分[]A．细胞壁B．细胞膜C．细胞液D．细胞核-七年级生物
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• 完形填空 The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952 ,on one smal