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External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells. Two of the most important internal factors are kinases and cyclins.
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the first one i think hope this helps
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Well, it helps us categorize organisms so we can more easily communicate biological information.
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a transgenic organism is one that contains rDNA; Recombinant DNA
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Transgenic organisms are organisms that contain foreign DNA (rDNA) which is normally introduced via biotechnology. The transgene is simply the DNA from another species or it can be also an rDNA from the same species which has been altered in the laboratory then reintroduced into the organism