Bacteria cells do have organelles, although generally these are fewer in number and less complicated than those found in plants and animals. Most commonly, bacteria contain ribosomes. These organelles are composed of RNA... More »

In cell biology, an organelle is a structure found within a cell that performs a particular specialized function. Organelles behave as the organs of the cell, and are found floating in a fluid called cytoplasm that is co... More »

Cellular walls, nuclei, vacuole and lysosomes are all examples of cellular organelles. Organelles are broadly classified as either mitochondria or plastids, depending on whether or not they contain DNA. Within a cell, ea... More » Science Biology Cells

Bacteria are simple organisms that are found in every type of environment, including on land, in the air, in water and on and inside plants and animals. A bacterium (or single bacteria) is a single-celled creature that c... More »

Mitosis occurs in almost all cells in plants and animals. It begins in the nucleus of the cell. As neurons become specialized (terminal differentiation) mitosis is switched off, so the cells can no longer reproduce. More »

Mitochondria are small organelles, found within the cells of plants and animals. Mitochondria supply energy to the cell in which they reside. They produce a molecule called ATP, which stores energy in its chemical bonds.... More »

Archaea and bacteria are prokaryotes that lack cell nuclei and membrane-bound organelles, while protists are eukaryotes that possess both of these features. Archaea and bacteria are always single celled, while a small nu... More »