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Macronucleus


A macronucleus 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 the micronuclei. The macronucleus...
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relatively large nucleus believed to influence many cell activities. It occurs in suctorian and ciliate protozoans (e.g., Paramecium). The macronucleus is associated with one or more smaller micronuclei, which are necessary for conjugation and autogamy (reproduction by exchange between the nuclei of different individuals and of the same individuals,...
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macronucleus synonyms. macronucleus usage examples and macronucleus quotes. ... macronucleus definition. macro·nu·cleus (mak′rō no̵̅o̅′klē əs) noun ...
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a large, polyploid macronucleus that contains the active genes that run the cell. ... The old macronucleus disintegrates and a new one is formed from the ...
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A complex DNA error-correction system that likely evolved from an ancient self-defense mechanism is still active in ... This macronucleus houses about 15 ...
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Development of the somatic macronucleus in some ciliates presents an extreme ... macronucleus, with each chromosome amplified to a high copy number, with some ...
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The macronucleus is highly polyploid (~800n in P. tetraurelia), divides ... During sexual events, the old macronucleus is degraded and replaced by a new one, ...
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Each cell contains a germ line micronucleus and a somatic macronucleus. ... All endogenous RPB3 genes in the macronucleus could be replaced by RPB3-HA (Fig. ...
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Paramecium caudatum. 1. Macronucleus. 2. Micronucleus. 3. Contractile vacuoles ... Note the large, kidney-shaped macronucleus that controls most of the metabolic ...
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Note the large, kidney-shaped macronucleus that controls most of the metabolic ... within a depression on the macronucleus) is the much smaller micronucleus, which ...
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... ciliate Chilodonella uncinata, the macronucleus is extensively fragmented such ... The macronucleus has a greater number of smaller chromosomes and is the site of ...
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... 6000 loci in the developing macronucleus (YAO and GOROVSKY 1974; YAO et al. ... The wide, open boxes represent the macronucleus-retained flanking regions. ...
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... called the macronucleus which controls ... Color the macronucleus red. ... 7. What do the macronucleus and micronucleus do? 8. Define conjugation. ...
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Macronucleus - Wikipedia, the free encyclopedia ... macronucleus /mac·ro·nu·cle·us/ (-noo'kle-us) the larger of two types of nuclei ...
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