根据植物结构示意图，回答下列问题。(1)具有保护和支持细胞功能的是[]__________。(2)犹如细胞门户，凡是进出细胞的物质都要由此结构选择的是[]__________。(3)烟叶中的烟碱-七年

更多内容推荐

• 阅读理解。 A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you
• 阅读理解。 The class in America is almost the same as that in China. But something is different.(1) In Am
• 阅读理解。 What is your favourite colour? Do you like yellow, orange or red? If you do, you must be optim
• 任务型阅读。 New rules and behavior standards (规范) for middle school students came out in March. Who are t
• 根据下图回答问题：(1)已知有一台显微镜，其目镜上标有10×，物镜上标有40×，则这台显微镜可以把物体放大_______倍。(2)使用显微镜观察玻片标本的正确步骤是__________。①收放-七年级
• 据细胞结构图回答问题：（1）下图中属于植物细胞结构的是_______图，属于动物细胞的是______图。从图中可以看出，植物细胞与动物细胞共同具有的结构是_____________。（2）其中能-七年
• 阅读理解。 It's 2009. You feel sick, so you go to the doctor. She checks your fever, looks at your t
• 根据短文内容判断正误。正确的在括号中写“T”，错误的写“F”。 Robots seem very new to most people. But they have a long history. T
• 完形填空。 Many people think the1 time is spent, the more work will be done. So students have to spend th
• 吸烟有害健康，原因是烟草含有对人体有害的物质(尼古丁)，这种物质主要存在于烟草细胞中的[]A．细胞壁上B．液泡中C．细胞核内D．细胞质中-八年级生物
• 阅读理解。 Do you know kind words and light music (轻音乐) have something to do with plants?Many people talk
• 阅读表达。 Dreams may be more important than sleep. Some people don't need much sleep. But we all ne
• 植物体上的绿叶，嫩茎等部分的细胞中的细胞质里含有一些绿色小颗粒叫__________，__________内含有__________等色素。-七年级生物
• 小刚同学在显微镜下观察到一些细胞，他判断是植物细胞。因为他观察到了[]A．细胞壁和液泡B．细胞壁和细胞膜C．细胞质和细胞核D．细胞膜和细胞质-八年级生物
• 阅读理解。 Not long ago, Richard Denniston found himself suffering the same pain that millions of other p
• 食物中储存的化学能来自于光能的转化，这种转化主要是通过植物细胞中的哪种结构实现的?[]A．细胞核B．细胞膜C．叶绿体D．线粒体-八年级生物
• 阅读理解。 This is the times of information technology. Pakistan (巴基斯坦) is also trying to keep up with th
• 制作洋葱表皮临时装片时，下面操作正确的是[]A．用餐巾纸擦拭载玻片B．将洋葱块直接放置在显微镜下观察C．用镊子将取下的洋葱表皮在水滴中展平D．染色时掀开盖玻片，滴入染液-七年级生物
• 阅读下面短文，根据短文内容完成下面表格。 Dreams may be more important than sleep. Some people don't need much slee
• 完形填空。 Many people say that they have seen flying saucers (飞碟) in the sky.1 can these things be?Some
• 阅读理解。 Radio, telephone and television are widely used in the world. When you witch on the radio, you
• 在制作洋葱表皮细胞临时装片时，正确的做法是[]A．尽量将材料撕得薄B．将盖玻片垂直于载玻片后迅速放下C．如有气泡，则用手轻压赶出D．盖上盖玻片后，可直接将稀碘液滴在盖玻片上-七年级生物
• 植物细胞中，具有控制物质进出作用的结构是[]A．细胞壁B．细胞膜C．细胞质D．细胞核-七年级生物
• 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
• 阅读理解。 As any homemaker who has tried to keep order at the dinner table knows, there is far more to a
• 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
• 完形填空。 India has sent1 first spaceship to the moon. Scientists sent the spaceship on October 22nd, 20
• 阅读理解。Hello,Can you name some foods in the meat group? Can you tell where they come from?Your body is
• 缺词填空。 Maybe you are more interested in sports than in history. You probably think you will never be
• 阅读理解。 When we talk about intelligence (智力), we do not mean the ability to get good scores on certain
• 阅读理解。 New rules and behavior standards (行为规范) for middle school students came out (颁布) in March. Mid
• 阅读理解。 Almost every child in cities has the chance to go to school, but not all children in the count
• 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
• 阅读理解。 Mails, games, music, news, chat rooms and shopping! The Interent is part of our life today. It
• 完形填空。 Like the body, the memory improves with use.1 the body, the memory can improve with age.For ma
• 阅读理解。 As we know, it is not easy to build a satellite. Building a traditional satellite normally tak
• 阅读下面的短文，将划线部分的句子译成汉语。 1 Dreams may be more important than sleep. Some people don't need very mu
• 阅读下列材料，从所给的A-F六个选项中，选出正确的选项填空，使短文通顺、内容完整。 Bears are found in Asia, Africa and America. They are very
• 阅读理解。 As we know, it is difficult for parents of every family to teach their children to be responsi
• 阅读理解。 Lichens (地衣) are difficult to see. They don't move. They often mix into the living place.
• 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
• 缺词填空。所填单词在题后横线上必须完整写出。 Mr. Louis B. Russell (1)l______ in Indianapolis, a city in the state of India
• 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