Types of Cells
a small dense spherical structure in the nucleus of a cell during interphase.
a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
the material of which the chromosomes of organisms other than bacteria (i.e., eukaryotes) are composed. It consists of protein, RNA, and DNA.
a minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.
a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.
an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
(in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane.
a small organelle that is present in the cytoplasm of many cells and that contains the reducing enzyme catalase and usually some oxidases.
a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
a microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence.