Ch.4 Lecture Notes

Ch.4 Lecture Notes - ChapterFourCells ,oriscomposed ofcells...

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Chapter Four-- Cells Every form of life is a cell, or is composed of cells Exception: viruses, but they need cells to reproduce Each cell came from a cell Each of your cells is a link in a cellular chain going back 3.5 billion years
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All cells have: A plasma (cell) membrane Cytoplasm (cytosol) Genetic material (DNA) There are two main cell types: Pro karyotes “before the nucleus” Eu karyotes “true nucleus”
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Prokaryotes DNA is in nucleoid region Usually smaller than eukaryotes Usually single celled May not need oxygen
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Ch.4 Lecture Notes - ChapterFourCells ,oriscomposed ofcells...

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