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The bacterium doesn't have a nucleus, and in fact, they don't have very well formed organelles in general.
细菌没有细胞核,实际上,细菌没有完善的细胞器
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A human cell shown here on the opposite side has these formed organelles that I talked about a minute ago, mitochondria, Golgi, endoplasmic reticulum, nucleus.
另一边展示的是人类细胞,它带有我一分钟前讲过的成形的细胞器,线粒体,高尔基体,内质网,细胞核
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It's encased within a membrane, a cell membrane which we talked about the structure of.
都是膜包围细胞器,我们刚讲过其结构的那种膜
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What else is different about human cells and bacteria other than these formed organelles?
除了细胞器以外,二者还有什么不同
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You took biology in high school, you learned the names of these organelles and their principle functions, the nucleus, the endoplasmic reticulum, the Golgi apparatus, mitochondria, lysosomes.
你们高中学过生物,学过这些细胞器的名称,和基本功能,细胞核,内质网,高尔基体,线粒体,溶酶体
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Human cells have well-described organelles inside of them.
人类细胞中有我们知之甚详的各种细胞器
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Why aren't they present in bacteria?
为什么细菌中没有细胞器
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Because these molecules can span across the membrane from outside to inside, they're in just the right position to take messages that they receive from outside the cell and transmit them through the membrane into the cells internal apparatus, and that's what they do.
因为这些分子能穿过细胞膜,连通细胞内外,它们所在的位置非常适于接受信息,它们能将外界获得的信息,通过细胞膜传递给细胞器,这正是它们的功能
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They have a nucleus, they have a cell membrane, they have organelles throughout them, they have the same DNA.
它们都有细胞核,细胞膜,细胞器遍布其中,它们有相同的DNA
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