转基因食品利弊英文作文

Should Genetically Modified Food be Stopped?

Along with the increased commercialization and planting of a range of genetically modified (GM) crops globally, the safety of genetically modified crops and genetically modified food (GMF) has become a hot topic and major public concern. In recent years, the issue of GMF has become one of the hottest debating topics around the society. So, should GMF be stopped?

Some think that GMF should not be stopped. GM food is new with both good prospects for growth and potential threats. Likewise, GM technology can allow crops to become resistant to drought and pests as well as produce a higher yield, whereas a vast majority of people hold that GMF can cause diseases which are immune to antibiotics. Moreover, some experts declare that people who consume to such food stand high chances of getting cancer. As the long-term effects on health are unknown, many people prefer to stay away from GM food.

As a scientific researcher, I think GMF should not be stopped. GM technology is one of cores of the knowledge economy in the 21th century. GMF is the inevitable product as the result of human productivity and GM technology progress. We pin on GM technology heavy hopes that it will better our life quality and get rid of poverty and hunger. And we cherish the hopes that scientists can do more researches about its health effects, and producers can mark GM food to ensure food safety and consumers' benefits.

转基因食物 英语作文(优.选)

Genetically Modified food With the science and technology expanding day by day,we can get and experience more and more things which have never existed before,such as plane,car and genetically modified food.The planes and cars can let us be more convenient in our daily life.However,so far we still do not clearly know all the aspects of genetically modified food.Do they damage to our healthy? So what is the genetically modified food?It is a kind of food that people apply modern molecular biotechnology,transfer some biological gene to other species, transform the genetic material of living things,change the shape, nutritional quality, consumer quality to the target of people's needs.So from the definition of GMF,we can know it happened for people's needs.We can have more options to cook and eat,and it also can save our money because this kind of food is usually cheaper and easier to plant than others.Originally, it is good for our life. While,almost 50 percent of the whole people in China believe that the genetically modified food is not safe to our healthy,but what is the fun thing is most of them don't know how the genetically modified food damage their healthy.They just are deeply misunderstanding and even have repellent psychology because of the long-time negative public opinion.

英语作文转基因食品ShouldGenetically-modifiedFoodbeStopped

班级：A17班姓名：学号：Should Genetically-modified Food be Stopped? Nowadays, the number of genetically-modified food is steadily increasing. There is an argument that whether this kind of food should be stopped . As far as I am concerned , genetically-modified food should not be stopped. Firstly, there is necessity for genetically-modified food to exist. Genetically-modified food belongs to food. The world is lack of resources. Every day, millions of people around the world eat only the bare minimum of food to keep themselves alive. They will be very grateful for having this kind of food to survive. Secondly, it is easier for us to plant genetically-modified food. At the same time, the production cost is also greatly reduced. As a result ,food prices will increasingly low. There is no doubt that it is good news for consumers. Thirdly, It will reduce the use of pesticides and then avoid the pollution of the environment. In addition, genetically-modified food can bring us many other benefits, for example, increasing food nutrition, increasing the types of food and so on. However，although genetically-modified food have so many advantages, some people still insist that they should never eat genetically-modified food. They are afraid of potential threat

转基因食品英文议论文

Genetically engineered food has always been a controversial topic. But on this issue, I hold the belief that large-scale cultivation of genetically engineered food is an irresistible trend. First and foremost, genetically engineered food is safe to be consumed. Since the introduction of genetically engineered food, people attach great importance to the safety of genetically modified foods. In 2016, the National Academy of Sciences,United States, after two years of research , released a report entitled "Genetically Engineered Crops: Experiences and Prospects". The report indicates that there is no evidence that genetically engineered foods will affect people's health negatively. On the contrary, genetically modified insect resistant crops are beneficial to human health because of reducing pesticide poisoning. The survey points out that, from 1996 to 2008, the United States reduced the use of pesticides by 64 million pounds due to planting insect-resistant transgenic crops. Genetically engineered foods can alleviate the shortage of food in the world and provide healthy and high-quality food for people. A report released by the United Nations indicates that 805 million of the world's population is suffering from famine. Meanwhile, the world's population is currently over 7 billion and is expected to double in the next 50 years. Ensuring adequate food supply is a great challenge. Genetically engineered foods can greatly increase grain production and according to the survey conducted by PG Economics, from 1996 to 2014, transgenic technology has made global grain increase by 5.14 million tons. Finally, Genetically engineered foods will greatly increase farmers' income and promote

转基因食品的安全性认识

对转基因食品安全性的认识 姓名：范丽娟 班级：食质101班 学号：2010037107

摘要：人们对转基因食品的安全性一直存有争执。有人支持有人反对，各有理由相持不下。从科技哲学的角度看，我们既不能过分夸大转基因技术和转基因食品的风险而忽视了它的潜在利益，也不能鼓吹它所带来的利益而视风险于不顾。对转基因技术、转基因食品的现在和未来需要人类做出理性的反思和审慎的决策。 关键词：转基因食品；安全性 一、转基因技术与转基因食品概述 所谓转基因技术就是应用人工方法把某种生物的遗传物质分离出来，在体外进行切割、拼接和重组，将重组了的DNA通过各种途径导入并整合到某种宿主细胞或者个体的细胞核中，有日的的改变它们的遗传性状。 转基因食品是利用现代分子生物技术，将某些生物的基因转移到其他物种中去，从而改造生物的遗传物质，使其在形状、营养品质、消费品质等方面向着人们所需要的目标转变。我国《转基因食品卫生管理办法》将转基因食品定义为：利用基因工程技术改变基因组构成的动物、植物、和微生物生产的食品和食品添加剂。 二、转基因食品的发展现状 随着现代生物技术的发展，其在农业中显现出越来越重要的地位，带来了巨大的经济效益和社会效益。转基因作物有着不可替代的优势，如解决粮食短缺问题，节省生产成本，降低食物售价等。 种植转基因的国家由最初的几个至现在的20多个，各国试种的转基因植物已经超过4 500种，其中大豆、玉米、棉花、油菜是主要的转基植物，这四类植物占全部转基因植物的86％。近年来，世界上转基因生物研发工作进展非常迅速。转基因动物层出不穷，转基因作物种植面积也以每年超过10%的速度增长。在中国，由于国家的重视，转基因的基础研究和应用为世界所关注，目前，已有近20种转基因植物进入了田间实验或环境释放阶段，6种转基因植物被批准进行商业化生产，转基因动物方面，转基因牛、转基因羊也纷纷出现。由于转基因作物产量高、价格低、耐贮运等特点，动物性转基因食品品质好、成本低、附加值高等原因，使得转基因食品的市场份额连年上升。 随着转基因动植物商品化步伐的加快，大量的转基因农产品已经直接或间接被制作成人类的消费品。目前, 世界各地的食品超市中均有转基因食品的销售。随着转基因食品的辐射范围扩大，关于转基因食品安全性问题的争执声音一直没有停止。

有关转基因食品的论文

论转基因食品 提到转基因食品，大家感觉可能都很熟悉，但何为转基因食品又为何生产转基因食品的呢？可能很多人对这个问题不太了解，首先，让我们先对这两个问题做一下了解。 在了解转基因食品之前，让我们先说一下转基因生物，转基因生物可界定为遗传物质（脱氧核糖核酸）已以非自然发生的方式改变的生物。该技术通常被称为“现代生物技术”或“基因技术”，有时候也称为“重组脱氧核糖核酸技术”或“遗传工程”。它可使选定的个体基因从一种生物转移到另一种生物，并且还可在不相关的物种之间转移。 这些方法用以产生转基因植物——然后将它们用于培植转基因粮食作物。通俗的说转基因食品就是将某一物种的特性基因转接到另一物种上面,人工创造出一种新物种. 例如，西红柿是一种营养丰富、经济价值很高的果蔬，但它不耐贮藏。科学家认为北极鱼体内某个基因有防冻作用，于是将它抽出，再植入蕃茄之内，制造新品种的耐寒蕃茄, 这种西红柿抗衰老，抗软化，耐贮藏，能长途运输，可减少加工生产及运输中的浪费。类似于这种方法生产的在、食品即为转基因食品。 那又为什么要生产转基因食品呢？ 转基因食品得以开发和销售是因为对这些食品的生产者或消费者存在着某些感知的好处。这是指将其转变为一种价格较低、利益更大或二者兼具的产品。最初，转基因种子开发者希望他们的产品获得生产者的接受，因此集中于农民所重视的革新上。 以转基因生物为基础开发植物的最初目标是改进作物保护。目前市场上的转基因作物主要目的在于通过增强对由昆虫或病毒引起的植物病的抗性或通过增强对除草剂的耐受性提高作物保护水平。 通过将从苏云金芽孢杆菌（BT）这种细菌中生产毒素的基因转入粮食作物，从而实现抗虫害抗性。这种毒素目前在农业中作为常规杀虫剂使用，并且供人食用是安全的。持续产生这种毒素的转基因作物已显示在特定情况下，如在虫害压力大的地方，需要较少量的杀虫剂。 通过从引起植物病的某些病毒中引入一种基因，从而实现抗病毒抗性。抗病毒抗性使植物较不易受这些病毒引起的疾病的影响，使作物产量更高。 通过从传送抗某些除草剂抗性的一种细菌中引入一种基因，从而实现抗除草剂耐受性。在杂草压力大的情况下，利用这些作物已造成减少使用除草剂数量。基于以上原因，生产转基因食品就显得比较受欢迎了。 虽然说转基因食品有很多好处，但是在技术不是很成熟之前，它的危险也是很大的。 据了解转基因食品的危害主要有一下几个方面： 1.基因技术采用耐抗菌素基因来标识转基因化的农作物，在基因食物进入人体后可能会影响抗生素对人体的药效，作物中的突变基因可能会导致新的疾病； 2.转基因技术中的蛋白质转移可能会引起人体对原本不过敏的食物产生过敏，分割重组后的新的蛋白质性状是否完全符合我们设想的需求有待考证；

关于转基因食品安全研究报告的感想-(3000字)

关于食品安全研究报告的感想 这次的研究性学习的题目是“转基因食品食用安全性问题研究” 很明显转基因食品是这次研究性学习的中心，然而什么是转基因食品 呢？ 转基因食品是利用现代分子生物技术，将某些生物的基因转移到其他 物种中去，改造生物的遗传物质，使其在形状、营养品质、消费品质等方 面向人们所需要的目标转变。以转基因生物为直接食品或为原料加工生产 的食品就是“转基因食品”,其原理是利用基因工程技术在物种基因组中嵌 入（非同种）外源基因。转基因作为一种新兴的生物技术手段，它的不成 熟和不确定性，必然使得转基因食品的安全性成为人们关注的焦点。所以 我选择了这个题目。在深入的了解之后我才知道转基因食品有利也有弊， 虽然没有得出一个准确的答案，但我明白了在组队的学习中分工合作是非常重要的。人类的种种困惑就应在合作中解决。 我认为转基因食品的安全性有利有弊。 其利在于，转基因食品生长周期短，同时抗病虫害能力强。但其弊端则 更加严重，由于毒素的累加，在防治害虫的同时，许多益虫，如青蛙等亦会 由于生物负集影响而中毒、导致死亡；并且，随着农作物抗病虫害能力增强， 许多害虫的抗药性和抗毒性也随之增强；更重要的是，这些农作物是给我们 食用的，随着时间的累积，必然也会对我们有所影响 据上述材料可知，我国仅占有世界上7%的耕地，却要养活世界上22% 的人口，这亦是一个重担，也从而致使转基因食品、转基因油等大量流入市 场，甚至从国外引进。并且，世界上最大的转基因公司——美国孟山都公司， 其所生产的转基因蔬菜等，在无法抵抗部分病虫害时，大量生产致命农药， 如敌敌畏等，随保护了其农作物，但其代价亦是巨大的，这便是由于转基因 食品的不足而造成的问题。 故我认为，对待转基因食品应当小心谨慎，避免危害，给我国人民 一个相对安全的食品环境。 与此同时，在进行这次研究性学习的过程中，我学会了从网络、书本 等途径中寻找相关资料、文献的方法，学会了对资料的整理、汇总，学会 了论文的写作方法，也发现了团队合作的重要性。我觉得学习到的这些宝贵经验会在我们以后的学习、研究中发挥重要的作用。

转基因食品安全论文食品卫生安全论文

转基因食品安全论文食品卫生安全论文 转基因食品不构成食品安全问题 经过严格审批和监管的转基因食品，并不存在有毒有害物质我从来不认为转基因食品问题是一个食品安全问题。这句话可能一些官员和老百姓都不同意，但是我坚持。 世界卫生组织对不安全食品有明确的定义，即食品中有毒有害物质对人体健康产生不良影响的公共卫生问题。这个定义中有两个关键词，一个是有毒有害物质，一个是对人体健康产生不良影响，这两个关键词必须同时并存，才能构成不安全食品的事件。 我们生活的环境(包括食物)中，有毒有害物质很常见，但有毒有害物质达到一定的量，才可能对人体健康造成危害。例如，对于国家允许使用的农药，我们不是规定食品中农药残留等于零，而是规定食品的农药残留允许的最大含量，只要不超过就是合格的。 实际上，经过严格审批和监管的转基因食品，并不存在有毒有害物质，更不要说量的问题。所以说，转基因食品本身并不构成食品安全问题。 食品安全是一个相对和动态的概念，没有一种食品是百分之百安全的，零风险的食品是不存在的。

在转基因食品的安全性评价中，有一个非常重要的原则：“实质等同” (Principle of subst antial Equiva-lence)。当转基因食品和相同品种的传统食品相比较，如果两者具有实质等同性，即两者之间没有什么显著区别，则可以认为其安全。而当前我国批准的转基因作物(包括水稻)与相同品种的传统作物在营养成分、营养价值和安全性方面是等同的。它们的不同体现在转基因作物的农业性状，如抗虫水稻可以少用杀虫剂。 当然，在转基因生物育种研究及其产业化进程中，需要独立的风险评估和安全性评价，政府的管理措施也要透明。 其中，风险评估和安全性评价是独立的专家行为，最基本的前提是科学和公正。专家根据科学实验与实践的结果，进行独立评价，不受政治、经济、文化等因素的影响。这和管理措施是不同的。管理措施(例如，批准一个新的农业转基因作物)需要以科学为基础，但不完全等同于科学，还得考虑科学以外政治、经济、文化、饮食习惯等多方面因素的影响。 任何一个农业新品种的诞生都是基因改变的结果，这是农业发展的根本。为什么没有人质疑袁隆平院士的杂交水稻新品种的安全性?因为人们普遍以为，传统的杂交方式是安全的，而人为的基因改变就是不安全的。同样的误解也出现在对食品添加剂的认识上，即天然的食品添加剂就是安全的，而化学合成的食品添加剂就是不安全

转基因食品利弊英文作文

Should Genetically Modified Food be Stopped? Along with the increased commercialization and planting of a range of genetically modified (GM) crops globally, the safety of genetically modified crops and genetically modified food (GMF) has become a hot topic and major public concern. In recent years, the issue of GMF has become one of the hottest debating topics around the society. So, should GMF be stopped? Some think that GMF should not be stopped. GM food is new with both good prospects for growth and potential threats. Likewise, GM technology can allow crops to become resistant to drought and pests as well as produce a higher yield, whereas a vast majority of people hold that GMF can cause diseases which are immune to antibiotics. Moreover, some experts declare that people who consume to such food stand high chances of getting cancer. As the long-term effects on health are unknown, many people prefer to stay away from GM food. As a scientific researcher, I think GMF should not be stopped. GM technology is one of cores of the knowledge economy in the 21th century. GMF is the inevitable product as the result of human productivity and GM technology progress. We pin on GM technology heavy hopes that it will better our life quality and get rid of poverty and hunger. And we cherish the hopes that scientists can do more researches about its health effects, and producers can mark GM food to ensure food safety and consumers' benefits.

转基因食品及其安全性(论文啊)

转基因食品及其安全 摘要：转基因食品自从出现以来就一直备受争议，近日转基因水稻、玉米等作物获得农业部农业转基因生物安全管理办公室颁发的安全证书，这一事件更是加剧了群众对于转基因食品的质疑，转基因食品的安全性的疑问又被重新摆上台面。本文对转基因食品的来源、分类以及其安全性做了初步探讨，对于帮助了解转基因食品及转基因食品的安全性都具有一定的理论意义和现实意义。 关键词：转基因食品安全性 一、转基因食品的定义 所谓转基因食品，就是通过基因工程技术将一种或几种外源性基因转移到某种特定的生物体中，并使其有效地表达出相应的产物（多肽或蛋白质），此过程叫转基因。以转基因生物为原料加工生产的食品就是转基因食品。根据转基因食品来源的不同可分为植物性转基因食品，动物性转基因食品和微生物性转基因食品。 转基因食品是具有一定的优点的，例如转基因食品可增加作物产量、降低生产成本；可增强作物抗虫害、抗病毒等的能力；提高农产品耐贮性；缩短作物开发的时间、摆脱四季供应、打破物种界限，不断培植新物种，生产出有利于人类健康的食品。 但是，即便转基因食品的优点非常多，其具有的一些缺点也是不容忽视的：所谓的增产是不受环境影响的情况下得出的，如果遇到雨雪的自然灾害，也有可能减

产更厉害。许多转基因食品本身就能产生一定量的有毒物质和某些营养因子以抵抗细菌和害虫的入侵。现有转基因食品中的毒素含量并不一定会引起毒反应，当然如若处理不当，某些食品（如木薯）能引起严重的问题甚至可能引发死亡。 根据《农业转基因生物标识管理办法》规定，我国目前已有5类17种在售转基因生物被列入转基因标识目录并在市场上销售，这17类转基因生物包括：大豆种子、大豆、大豆粉、大豆油、豆粕、玉米种子、玉米、玉米油、玉米粉、油菜种子、油菜籽、油菜籽油、油菜籽粕、棉花种子、番茄种子、鲜番茄、番茄酱。卫生部的《转基因食品卫生管理办法》则规定，食品产品中(包括原料及其加工的食品)含有基因修饰有机体的，要标注“转基因××食品”或“以转基因××食品为原料”。卫生部对转基因食品的生产经营组织定期或者不定期监督抽查，并向社会公布监督抽查结果。 二、转基因食品的分类 转基因食品包括以下几类： 第一类，植物性转基因食品。植物性转基因食品很多。例如，面包生产需要高蛋白质含量的小麦，而目前的小麦品种含蛋白质较低，将高效表达的蛋白基因转入小麦，将会使做成的面包具有更好的焙烤性能。番茄是一种营养丰富、经济价值很高的果蔬，但它不耐贮藏。为了解决番茄这类果实的贮藏问题，研究者发现，控制植物衰老激素乙烯合成的酶基因，是导致植物衰老的重要基因，如果能够利用基因工程的方法抑制这个基因的表达，那么衰老激素乙烯的生物合成就会得到控制，番茄也就不会容易变软和腐烂了。美国、中国等国家的多位科学家经过努力，已培育

转基因食物利弊英语作文

What is GM food? Talk about the benefits and risks of GM food. GM foods,so called genetically modified foods,are the foods that are derived from genetically modified organisms. Genetically modified organisms have had specific changes introduced into their DNA by genetic engineering techniques. GM technology is the separation and decorated artificial genes into the genome of organisms, and to gene expression, access to new traits of biological technology. Since this technology was practiced,genetically modified food has developed a lot.In 1983,world’s first case of successful cultivation is tobacco.In 1994,the U.S. first case of GM food is tomatoes.In 1996,large-scale production has come into use.Since that,the amount of GM foods increased by 52 times each year.People have shared a lot of advantages as time went by.GM crops are more productive and have a larger yield. They can offer more nutritional value and better flavor. What is more,a possibility that they could eliminate allergy-causing properties in some foods and inbuilt resistance to pests, weeds and disease. They are also more capable of thriving in regions with poor soil or adverse climates and remaining fresh longer.Still,at the same time,much danger has been put up all the way. For example,in August 1998,a British research institute reported that rats ate GM potatoes, which was insect-resistant transgenic potatoes produced by snowdrop lectin .And there was damage to internal organs and immune systems and this impeded the growth of mice.Apart from what we have mentioned above,genetically modified foods has also exerted influence on the possible impact of human consumption and may affect the ecological environment,such as super weed

英文议论文素材大全——转基因食品的利与弊

Arguments Pros Cons Genetic modification is unnatural. There is a fundamental difference between modification via selective breeding and genetic engineering techniques. The former occurs over thousands of years and so the genes are changed much more gradually. Genetic modification will supposedly deliver much but we have not had the time to assess the long-term consequences. In addition, many of the claims made by the companies have now been shown to be false. For example, a recent study by the Soil Association shows that GM crops do not increase yield. Another example is a frost-resistant cotton plant that ended up not ripening. Genetic modification is entirely natural. The process of crop cultivation by selective breeding, which has been performed by farmers for thousands of years, leads to exactly the same kind of changes in DNA as modern modification techniques do. Current techniques are just faster and more selective. In fact, given two strands of DNA, created from the same original strand, one by selective breeding and one by modern modification techniques it is impossible to tell which is which. The changes caused by selective breeding have been just as radical as current modifications. Wheat, for example, was cultivated, through selective breeding, from an almost no-yield rice-type crop into the super-crop it is today. It is wrong to introduce the DNA of one species into the genes of another - e.g. using fish genes in tomato plants to make them frost-resistant. This attempt to 'play God' is short-sighted and unnatural. It is perfectly natural and safe to introduce genes from one organism into another. We must remember that all DNA is made up of the same four fundamental molecules regardless of which organism the DNA came from originally. It is also worth noting that DNA from all organisms is very similar. Human DNA is 99% the same as chimpanzee DNA and about 50% the same as grass DNA. Consequently, the addition of genes from one organism into the DNA of another is like adding Lego bricks to one another to create a desired final structure. Indeed such processes occur all the time in nature in sexual reproduction. There are two problems associated with scientifically testing the impact of genetic modification of food. 'Peer review' (the checking of scientific test results by fellow scientists) is often made impossible by the unwillingness of biotechnology companies to give up their results for review. Monsanto, for example, has never published even one of its results. Furthermore, government agencies are often unwilling to stop GM foodstuffs reaching the shelf because of the clout that the companies have with their government. This debate should be decided on the basis of hard facts, not woolly assertions and environmental sentiment. Until scientific tests show there to be some real risk of harm from farming and eating GM food there is no case for a ban or a moratorium. Not only is genetically modification natural and well understood but extensive testing is applied to every new GM foodstuff before it is placed on the market. This testing takes two forms. Peer review by other scientists and testing by the food standards agency in whichever country the product is to be marketed. For example, in the United States all GM food must be tested for nine years before its release onto the market. In fact, testing has been so successful that in the 30 year history of GM food not one single person has died due to genetic modification. GM food will do nothing to help solve the problems in developing countries. The problem there is not one of food production but of an inability to distribute the food (due to wars, for example), the The possible benefits from GM food are enormous. Modifications which render plants less vulnerable from pests lead to less pesticide use which is better for the environment. Other

转基因食品安全性论文转基因食品 论文

转基因食品的安全性及发展前景 姜 晔 55 安徽科技 ANHUI SCIENCE &TECHNOLOGY 2010年第10期 作为生命科学的前沿技术，生物技术每向前迈出一步，都会给生命科学以及包括食品科学在内的相关学科带来革命性的影响。作为食品科学基础理论体系的组成部分，生物技术也必将通过食品科学的终端产品对人类的营养和健康产生深远而广泛的、正面或负面的影响。作为现代化生物技术的核心内容，基因工程技术自20世纪 70年代诞生以来，以日新月异的速度迅猛发展，其产物──转基因产品已在医药、农业、环保、食品工业等诸多领域占据了日益重要的地位，在一定程度上加速催化了这种影响。 基因是控制生物遗传性状的基本遗传单位。在基因克隆技术建立之前，育种学家通过常规育种杂交等方法把某一植物中的优良性状的基因导入到所选用的作物品种中去，培养出许多优质高产的作物品种。随着生物技术的发展，现在，科学家能够获得更多用于改良作物品质的基因，例如控制蛋白质含量、抗逆抗病基因，将其连接到一个载体上，然后用含有目的基因的载体将基因转到植物的细胞中去，再通过细胞的培养等培育出转基因植株。那么含有转目的基因植株所生产出来的食品就是转基因 食品。 就功效来说，目前转基因技术涉及的领域主要有改善粮油食品的产量、食用品质和加工功能特性，延长果蔬的贮藏期，提高农作物的抗病虫害性能，改善动物性食品的成分比例和食用品质，改善发酵食品的风味和品质、提高产量等。 1．转基因植物性食品 世界上第一种转基因植物食品是1993美国政府批准上市的Calgene 公司研制的延熟保鲜转基因西红柿。 1999年，转基因作物已经在美国、加拿大、阿根廷、中国等12个国家种植，种植面积已达3990万公顷。其中，美国占全球种植面积的72%左右，其次是阿根廷、加拿大和中国。油菜、玉米和大豆是主要的转基因作物。目前美国近4000种食品包含转基因技术。转基因农业的新时代已经到来。 转基因生物技术可以加快农作物的生长速度、增加产量、增强抗病性、增强对环境的适应能力、增强耐储藏性能或抵抗除草剂和杀虫剂的能力，改良植物性食品的营养品质。例如，20世纪80年代初，DNA 重组技术和细胞融合技术相结合，培育出高产、抗虫、抗病、抗逆、生长快、高蛋白的基因改良植物。蛋白酶抑制基因、淀粉酶抑制基因、外源凝集素基因、昆虫毒素基因均已被克隆和转化入相应的植物。 2．转基因动物性食品 转基因动物的研究主要以培育生长速度快、抗病力强、肉质好的转基因动物为目标。主要是从目的供体物种体内获得带有特定优良遗传性状的DNA 片段，即目的基因，直接或通过载体导入被改造物种即“受体物种”的胚胎内，培养出优良的新品种。经过10多年的发展，生长速率快、抗病力强、肉质好的转基因兔、鱼、猪 、鸡已经成功 一、转基因食品的产生及功效 二、转基因食品的种类

转基因食品安全性分析阅读答案.doc

转基因食品安全性分析阅读答案 转基因食品就是指利用现代分子生物技术，把动植物的基因加以改变，再制造出具备新特征的食品种类。转基因食品安全吗?以下是我为你整理的，希望能帮到你。 《转基因食品安全性分析》阅读材料 转基因食品就是指利用现代分子生物技术，把动植物的基因加以改变，再制造出具备新特征的食品种类。其优点显著，但转基因食品存在很多不容忽视的存在的或潜在的危害性。 新基因的转入，打破了原来生物基因的"管理体制"，使一些产生毒素的沉默基因开启，产生有毒物质。有资料证实，转基因食品可能导致生物体系统失调、诱发癌症并传递给下一代，此过程可能需要30年或更长的时间。人为转入外源基因极有可能使原有的基因发生缺失和错码等突变。美国生产的一种耐除草剂转基因大豆的抗癌成分异黄酮就比一般大豆低12%～14%。 全世界约有2%的人群对某些食品产生过敏性反应。1996年美国先锋种子公司将巴西坚果某基因转入大豆中，结果对巴西坚果过敏的人群也对该大豆过敏，该大豆种子最终没有被批准商业化生产。人们在食用了这种改良食物后，食物会在人体内将抗药性基因传给致病细菌，使人体产生抗药性。在英国，做过切除大肠组织手术的志愿者，食用过用转基因大豆做成的汉堡包之后，在其小肠肠道的细菌中检测到了转基因DNA的残留物。而转基因食品对人体健康的严重影响，可能需要经过较长时间才能逐渐表现

和检测出来。 很多转基因生物具有较强的生存能力或抗逆性，这样的生物一旦进入环境中，将会取代原来的作物，造成物种灭绝，但这种问题可能要经过许多年后才能显现出来。如一些盐碱、沼泽、雨林及有寄生虫的地区，以前原本不适合农业种植，这些地区都被用来种植农作物，从而使原本生活在这里的生物的栖息地遭到破坏，造成生态系统失衡，最终导致物种退化、减少甚至灭绝。 转基因生物将增强目标害虫的抗性。专家警告，如果这种具有转基因抗性的害虫变成具有抵抗性的超级害虫，就需要喷洒更多的农药，而这将会对农田和自然生态环境造成更大的危害。由于转基因作物特性优良，很多人选择种植转基因作物，使某些作物的多样性大大降低。保持生物多样性是减少生物遭受疫病侵袭的重要方式。1864年的爱尔兰马铃薯枯死病，造成100多万人死亡，数百人流离失所，原因就是当地人只种植两个土豆品种。 转基因作物可能将其抗性基因杂交传递给其野生亲缘种，从而使本是杂草的野生亲缘种变为无敌杂草。基因漂移的过程很难人为控制，其后果也难以预测。在加拿大，被用于试验的油菜，只具有抗草甘膦、抗草胺膦和抗咪唑啉酮功能中的一种功能，后来发现了同时具备这三种功能的油菜，说明这三种油菜之间产生了杂交，这种油菜对周围植物造成了很大影响。《转基因食品安全性分析》阅读题目 9. 下列不能说明"转基因食品对人体的危害"这一观点的一项是() A.转基因食品可能在30年或者更长的时间，诱发癌症并传递给下一代。