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There are also occasional exceptions to the number of membranes surrounding organelles, listed in the tables below (e.g., some that are listed as double-membrane are sometimes found with single or triple membranes).In addition, the number of individual organelles of each type found in a given cell varies depending upon the function of that cell.In fact, a plausible explanation for the couplets was presented in the young-earth creationist literature one year prior to Davidson and Wolgemuth’s article. Davidson and Wolgemuth, however, present a new “spin” on the argument: they claim that the correlation between these “varve” counts and radiocarbon dates (as well as tree-ring counts), proves that the Lake Suigetsu varves are true annual events, thus presenting an unanswerable argument for an old earth. However, careful examination of the papers they cite shows that this apparent agreement is the result of the typical uniformitarian circular reasoning.
They were among the first biological discoveries made after the invention of the microscope.
Not all eukaryotic cells have each of the organelles listed below.
Exceptional organisms have cells that do not include some organelles that might otherwise be considered universal to eukaryotes (such as mitochondria).
) is a specialized subunit within a cell that has a specific function.
Individual organelles are usually separately enclosed within their own lipid bilayers.