Mitochondria are small, spherical or cylindrical organelles. Generally a mitochondrion is 2.8 microns long and about 0.5 microns wide. it is about 150 times smaller than the nucleus.

Let’s reason our way through this. Organelles are the substructures (such as mitochondria and chloroplasts) inside cells that perform particular functions. They are therefore smaller than cells.

Cytoplasmic organelles are “little organs” that are suspended in the cytoplasm of the cell. Each type of organelle has a definite structure and a specific role in the function of the cell. Examples of cytoplasmic organelles are mitochondrion, ribosomes, endoplasmic reticulum, golgi apparatus, and lysosomes.

The largest organelle in a cell is the nucleus; the next largest would be the chloroplast— only found in plant cells—which is substantially larger than a mitochondrion. The smallest organelle in a cell is the ribosome (the site for the manufacture of proteins within the cell).

Ribosomes are the smallest organelle in the common cells.

Note: The largest cell organelle, in general, is considered to be the nucleus. Though in plant cells, the vacuole takes up about 80-90% of the volume, thus being the largest cell organelle in a plant cell.

ribosome

uvella represents the largest plastid genome currently reported from a nonphotosynthetic alga or plant.

chloroplast (green plastid), 2. the chromoplast (coloured plastid) and 3. leucoplast (colourless plastid). The term plastid was coined by Ernst Haeckel in the year 1866.

Albert von Kolliker

The largest animal cell is Ostrich egg and largest plant cell is Acetobularia. largest cells are the birds’ egg(actuaaly the centre yellow sphere).

chondriosome

Nuclear DNA contains about 20,000 encoding genes while mtDNA carries just 37 genes. Thus, siblings from the same mother have the same mitochondrial DNA. In fact, any two people will have an identical mitochondrial DNA sequence if they are related by an unbroken maternal lineage.