Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model for __________,

which may have preceded cells. Fill in the blank(s) with the appropriate word(s).


ANSWER: protocells

Biology & Microbiology

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The leakage of vascular fluid into tissues is called ________.

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In the reproductive cycle of a fern, a zygote develops into

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Which factor initiates the intrinsic clotting mechanism?

a. factor X b. factor XI c. factor ACI d. thrombin e. prothrombin activator

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