Eukaryotic cells are typically much larger than those of prokaryotes. They have a variety of internal membrane-bound structures, called organelles, and a cytoskeleton composed of microtubules, microfilaments, and intermediate filaments, which play an important role in defining the cell's organization and shape.ukaryotes belong to the taxon Eukarya or Eukaryota. The defining feature that sets eukaryotic cells apart from prokaryotic cells (Bacteria and Archaea) is that they have membrane-bound organelles, especially the nucleus, which contains the genetic material, and is enclosed by the nuclear envelope.
Crappie spawn from late December through March in most southern waters. Old Papermouth is pursued vigorously by perhaps a wider range of anglers than any other species. Winter sees many heated docks walled with anglers aged 3 to 103, all chasing crappie.
Black crappies have seven or eight dorsal spines while white crappie have only six. Black crappie prefer clear, slightly acidic waters and spawn slightly before the white crappie in the spring. When water temperatures warm to about 60 degrees, the black crappie begin spawning.