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Mandatory Terms

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Term
Definition
Spontaneous Generation   An early and now disproved theory that living organisms come to life spontaneously from nonliving material  
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Biogenesis   The scientific principle that living organisms come only from other living organisms  
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Half-life   The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope  
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Endosymbiosis   A mutually beneficial relationship in which one organism lives within another; a theory that eukaryotic cells originated through endosymbiotic relationships between ancient prokaryotic cells  
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Microsphere   A microscopic spherical structure composed of many protein  
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Coacervate   A mass of droplets of colloidal substances, such as lipids, amino acids, and sugars, that are held together by electrostatic attraction  
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Radioactive Decay   The disintergration of an unstable atomic nuclues into one or more different nuclides, accompanied by the emission of radiation, the nuclear capture or ejection of electrons, or fission  
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