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Biology Chapter 14
Biology Chaper 14 Vocab
| Term | Definition |
|---|---|
| biogenesis | the scientific principle that living organisms come only from other living organisms |
| spontaneous generation | an early and now disproved theory that living organisms come to life spontaneously from nonliving material |
| radiometric dating | a method of determining the absolute age of an object by comparing the relative percentages of radioactive parent isotope and a stable daughter isotope |
| isotope | an atom that has the same number of protons or the same atomic number as other atoms of the same element do but that has a different number of neutrons |
| mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom |
| radioactive decay | the disintegration of an unstable atomic nucleus into one or more different nuclides, accompanied by the emission of radiation, the nuclear capture or ejection of electrons, or fision |
| radioactive isotope | an isotope that has an unstable nucleus and that emits radiation |
| half-life | the time required for half od a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope |
| microsphere | a microscopic spherical structure composed of many protein molecules that are organized a as membrane |
| coacervate | a mass of droplets of colloidal substances, such as lipids, amino acids, and sugars, that are held together by electrostatic |
| ribozyme | a cell organelle composed of RNA and protein; the site of protein synthesis |
| archaea | in a modern taxonomic system, a domain made up of prokaryotes that can live in extreme environments and that are differentiated from other prokaryotes by various important chemical differences; this domain aligns with the traditional kingdom Archaebacter |
| chemosynthesis | the production of carbohydrates through the use of energy from inorganic molecules instead of light |
| cyanobacteria | a group of bacteria that can carry out photosynthesis; formerly called blue-green algae |
| ozone | a gas molecule that is made up of three oxygen atoms |
| 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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frankk17
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