This is a useful note I took in class: Living things must maintain a high level of organized activity. Let's work backwards from the cell's point of view: *The ultimate thing a cell must do is to produce copies of itself. All cells are mortal. Cell lines that do not reproduce will go extinct; therefore, logically, all existing cell lines must reproduce (simply because they are NOT extinct IF they are existing!). *To reproduce, a …
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…cell was probably nothing more than a membrane sac enclosing nucleic acids (genes), enzymes and their products. But what a potential that sac had, because once cells were isolated, they could evolve more and more efficient ways of doing the functions listed above. The modern cell is the result of over 3 billion years of improvements in design. notes: - didnt get a grade since its a note - helped me, hope it can help you