ABSTRACT
However, animal and plant cells may differ from each other only in some organelles. Therefore, it is useful to have an understanding of different biocell types, their distinctions, component organelles, and fundamental characters. The eukaryotic nucleus consists of DNA, which is bound to proteins and organized into chromosomes. Within eukaryotic cells are found discrete regions that are usually delimited from the rest of the cell by membranes. Respiratory and photosynthetic enzymes are not segregated into discrete organelles, although they have an orderly arrangement. This cell consists of cytoplasm enclosed within a cytoplasmic membrane which presses against the cell wall which, in turn, is surrounded by a slime layer. A brief description of some organelles of a typical mammalian cell is given in the following sections. External to these membranes, several extremely specialized organelles like mitochondria exist. Mitochondria are found in all eukaryotic cells.
