A macronucleus (formerly also meganucleus) is the larger type of nucleus in ciliates. Macronuclei are polyploid and undergo direct division without mitosis. It controls the non-reproductive cell functions, the everyday tasks, such as metabolism. During conjugation, the macronucleus disintegrates, and a new macronucleus is formed by karyogamy of th...
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relatively large nucleus believed to influence many cell activities. It occurs in suctorian and ciliate protozoans (e.g., Paramecium). The ... [3 related articles]
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The larger nucleus (or sometimes nuclei) in ciliate protozoans. Derived from the micronucleus by a process of DNA polytenisation. The DNA in the macronucleus is actively transcribed. The macronucleus degenerates before conjugation. ... (18 Nov 1997) ...
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The larger nucleus (or sometimes nuclei) in ciliate protozoans. Derived from the micronucleus by a process of DNA polytenisation. The DNA in the macronucleus is actively transcribed. The macronucleus degenerates before conjugation.
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Type: Term Pronunciation: mak′rō-nū′klē-ŭs Definitions: 1. A nucleus that occupies a relatively large portion of the cell, or the larger nucleus where two or more are present in a cell. 2. The larger of the two nuclei in ciliates, which governs vegetative metabolic functions and not reproduction. Synonyms: meganucleu...
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macronucleus (s), macronuclei (pl) The larger of two nuclei in most ciliate protozoans, involved in nonreproductive functions; such as, feeding and metabolism.
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larger nucleus in ciliate protists that have two nuclei; polyploid with a reduced genome of metabolic genes and derived from the micronucleus
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