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macronucleus
(redirected from macronuclei)

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macronucleus /mac·ro·nu·cle·us/ (-noo´kle-us) the larger of two types of nuclei when more than one is present in a cell.
mac·ro·nu·cle·us (mkr-nkl-s)
n.
The larger of two nuclei present in ciliate protozoans, which controls the nonreproductive functions of the cell.
macro·nucle·ar adj.
macronucleus
[-no̅o̅′klē·əs]
Etymology: Gk, makros + L, nucleus, nut
1 a large nucleus that occupies a relatively large portion of the cell.
2 (in protozoa) the larger of two nuclei in each cell, governing cell metabolism and growth as opposed to the micronucleus, which functions in sexual reproduction.
macronucleus
the larger nucleus when there are two in the cell.
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They explain laboratory techniques for investigating such topics as genetic processes, mating types, microneuclei and macronuclei, cortical morphogenesis, and behavior.
Paramecium genetics and epigentics by SciTech Book News
Finally, the nucleus splits into eight parts, four of which become macronuclei and four micronuclei.
Protozoan machinery grinds parental genes by Vergano, Dan / Science News
 
 
 
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