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Bacteria are microscopic organisms which live on the surface of objects. They are one of the most ancient living things, which exist on this planet for nearly 4,000 million years. Do you know the size of bacteria It can only be measured in microns. Maybe you have not a standard in your mind how long a micron is. One micron is a thousandth of a millimeter, which equals about the diameter of a pinhead. Therefore, even if we enlarged the rounded bacterium a thousand times, it would only be the size of a pinhead. We barely see bacteria by a magnification an ordinary microscope of 100 times, even if we try, we cannot make out anything of their structure. There are normally millions of them together, for they can multiply really fast. Scientists have found that some bacteria have attached to wavy-looking "hairs" called flagella. T A. Bacteria are as big as a pinhead. B. Bacteria can not be seen by an ordinary microscope. C. Bacteria are hard to see because they often live together. D. Bacteria are very small so they can only be measured in microns. 查看答案 更多"{{B}}Text 2{{/B}} Bacte"的相关试题: [单项选择]{{B}}Text 2{{/B}} Bacteria are microscopic organisms which live on the surface of objects. They are one of the most ancient living things, which exist on this planet for nearly 4,000 million years. Do you know the size of bacteria It can only be measured in microns. Maybe you have not a standard in your mind how long a micron is. One micron is a thousandth of a millimeter, which equals about the diameter of a pinhead. Therefore, even if we enlarged the rounded bacterium a thousand times, it would only be the size of a pinhead. We barely see bacteria by a magnification an ordinary microscope of 100 times, even if we try, we cannot make out anything of their structure. There are normally millions of them together, for they can multiply really fast. Scientists have found that some bacteria have attached to wavy-looking "hairs" called flagella. T A. Flagella are part of bacteria. B. Flagella help bacteria to move. C. Flagella are always going round and round. D. Flagella are like waves. 查看答案 [单项选择] The vegetative forms of most bacteria axe killed by drying in air, although the different species exhibit pronounced differences in their resistance. The tubercle bacillus is one of the more resistant, and vibrio cholcra is one of the more sensitive to drying In general, the encapsulated organisms are more resistant than the non-encapsulated forms. Spores are quite resistant to drying; the spores of the anthrax bacillus, for example, will germinate alter remaining in a dry condition for years or more. The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection, for the length of time that a droplet remains infective is a result, primarily, of the resistance of the particular microorganism to drying. Tuberculosis is highly infectious because （） A. spores are resistant to drying B. the causative organism is encapsulated C. droplets of sputum remain infective for a long time due to the resistance of the organisms to drying D. none of these 查看答案 [单项选择]The vegetative forms of most bacteria are killed by drying in air, although the different species exhibit pronounced differences in their resistance. The tubercle bacillus is one of the more resistant, and vibrio cholera is one of the more sensitive to drying. In general, the encapsulated organisms are more resistant than the non-encapsulated forms. Spores are quite resistant to drying; the spores of the anthrax bacillus, for example, will germinate after remaining in a dry condition for ten years or more. The resistance of the pathogenic forms causing disease of the upper respiratory tract is of particular interest in connection with airborne infection, for the length of time that a droplet remains infective is a result, primarily, of the resistance of the particular microorganism to drying. The passage uses the term "vegetative forms" to refer to ______. A. plants that infest human habitations B. the feet that bacteria are really vegetables C. the growing stage of the bacteria as opposed to the dormant stage D. the difficulty in classifying the types of bacteria 查看答案 我来回答: 提交 最新试题 ●    [判断题]吴某在未取得典当行业许可证的情况下，在承接一起典当物品时，不查验有关证明，也不履行登记手续 ●    [单选题]《商业银行业务连续性监管指引》规定，商业银行应当（）对本行业务连续性管理进行审计，每三年至 ●    [判断题]列车发生紧急制动停车后,车辆乘务员应联系司机,检查车辆技术状态,可继续运行时通知司机开车。 ●    以下各项叙述中，胃癌根治术D2所代表的意义是（） ●    正常人肠道中最多的细菌是（） ●    水泥混凝土路面横向缩缝的构造一般有（） 网站地图 我要搜题网  版权所有  ©2024  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 截图扫码使用小程序[完全免费查看答案] 前往小程序 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码