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 »

Organelles are structures within a cell that have specific functions; membrane-bound organelles are organelles protected by a single or double plasma membrane. Mitochondria, lysosomes, the endoplasmic reticulum and the G... More »

There are more than four organelles that are common to most eukaryotic cells, with organelles such as the nucleus, mitochondria, Golgi apparatus and ribosomes. Other organelles common to eukaryotic cells include the lyso... More »

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 »