Cells in the human body generally have a nucleus and a certain number of chromosomes, but mature red blood cells do not have a nucleus.
Cells are the basic structures and units of living organisms, mainly composed of cell walls, cell membranes, cytoplasm, organelles, and nuclei, so all cells in the human body have nuclei, but mature red blood cells do not have nuclei.
There is chromatin, nuclear fluid and nucleolus in the nucleus. The nucleus plays a major role in the cell, and most of the genetic material is in the nucleus, if it is a nucleusless cell means that there is no active life activity.
Cells can be divided into eukaryotic cells, prokaryotic cells, and paleokaryotic cells according to their types, in which eukaryotes are organisms composed of eukaryotic cells, including yeast, penicillium, and other fungi in addition to plants and animals, all of which belong to the eukaryotic organisms. And cells also undergo division, differentiation and death.