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In time the anaerobe made a big new membrane to trap the aerobe. It took some of the genes from the aerobe so it could never leave. The aerobe now became a mitochondrion.
Perhaps the genes which the anaerobe took would not fit into a single chromosome, or perhaps for some other reason, but anyway its genes were split over several chromosomes. These chromosomes were wrapped up in a membrane in the middle of the cell to make the nucleus. Notice we used the same word to describe the central part of an atom, because the word means center.
All cells more advanced than bacteria are like this. They are called eukaryotes ("you-carry-oats"). The name means "well centered".
Almost all the plant and animal cells you can see around you are eukaryotic. They contain structures called organelles. To get an idea of the size of eukaryotes why not visit Soccearth? |
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Useful Links |
Biological Environment > Eukaryotes
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This site tells the story of the history of the universe. Click Earlier and Later to follow the story.
Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
