用什么可赶走共黄鼠狼:细菌是怎么产生的

来源:百度文库 编辑:杭州交通信息网 时间:2024/05/01 13:12:35
如题,知道多少说多少,感谢赐教

呵呵,要是我能回答你这个问题
我能拿nobel了,开个玩笑

其实细菌的起源问题和生命的起源问题一样,现今都无法给出合理的解释,而且也很难得到实验的验证
我所知的关于这方面的,可能就是miller在模拟条件下合成出了肽之类的有机物而已。目前离人工验证生命的起源还有非常长的路要走
但是我们不妨大胆假设一下,也许从无机物到有机物,再到具有初步与外界交换特征的有机物集合体,由此可能进化途径发生了分道扬镳,分别进化成了原核生物,真核生物和古细菌,并且在进化过程中,三者之间一定发生了遗传信息的交流,由此形成当今的局面

呵呵,说了半天,还是没能解决你的问题

Germs are tiny organisms that creep into our bodies and attack our immune system.

Unable to live on their own, germs invade our bodies and steal the nutrients and energy that our bodies produce. After gobbling up all of our nutrients and vitamins the germs leave behind their own harmful wastes called toxins. These toxins are the sources of our runny noses, high fevers, diarrhea and hoarse coughs.

Think back to the last time you were sick. Did you have a fever, runny nose, stomach ache, or throw-up often? Did you have to visit your doctor? Did you need medicine to help you get better.

Well… did you ever wonder why or how you became sick? Chances are that germs were the source of your illness.

There are many different kinds of germs, but the four most common are: bacteria, viruses, fungi and protozoa. Each of these types of germs cause different symptoms or illnesses. For instance, while bacteria germs cause minor illnesses such as ear infections, sore throats and cavities, viruses cause more serious diseases such as chicken pox, measles and the flu.

Although germs are everywhere, most of the time we don't realize that we have germs because they are so small that you need a microscope to see them. Germs spread through the air when someone coughs or sneezes. Or germs can also appear in bodily fluids like saliva, sweat and blood. The best way to avoid getting germs is stay away from these areas where germs spread. But the most easiest way to protect yourself from germs is to wash your hands with soap and water frequently. You should always soap up your hands with suds after using the bathroom, after touching money, after playing outside or after visiting a sick friend or relative

有种微生物叫极端微生物,有专家说根据这些微生物的特性,有可能地球上的最初生命来自外太空

地球上的生物分真核生物和原核生物,人就是真核生物,细菌是原核生物,几亿年前,地球上刚出现的生命就是原核生物,是碳,氢,氧等元素合成的,有空去看一下高中生物书,如想了解得更详细,可以看一下大学课本《微生物学》。

我不知道这个问题是好笑呢,还是问的人无聊,总之是个太奇怪的问题了。我想反问一句:什麼地方没有细菌呢?

生物进化形成的呗