Ribosomes are the most numerous organelles in many cells. Ribosomes are not surrounded by membrane. There is two kind of ribsomes, free and attached. Ribsomes most important role is the protein synthesis.
Lysosomes
Small, spherical organelles that enclose hydrolysic enzymes in single membranes. Lysomes digest proteins,carbohydrates,lipids,DNA and RNA. Lysomes may also digest old organelles as well as viruses and bacteria that have been ingested by a cell.
Mitochondria
Mitochondria that is scattered throughout the cytosol are relatively large organelles. Mitochondrias important job is to transfer energy from organic compounds to ATP.
Golgi Apparatus
Golgi is found in most eucaryotic cells. It is part of endomembrane system. Golgi has many many jobs. It is processing, packaging and secreting organelle of the cell. Golgi apparatus is a system of membranes. It appears as a flattened series in the cytosol.
Centrioles
A cylindrical cell structure, found in eukaryotic cells surrounded by an amorphous mass of dense material. Typically located on the cytoplasm, near to nucleus. The position of the centriole determines the position of the nucleus. Plays a crucial role in the spatial arrangement of the cell.
Vacuole
A small cavity in the cytoplasm of a cell, and it is second common characteristic of plant cell. Vacuoles are fluid-filled organelles, that store enzymes and metabolic wastes.
Peroxisomes
Organelles that are found virtually all eukaryotic cells and are involved in catabolism of vary long chain fatty acids.
A major function of the peroxisome is the breakdown of very long chain fatty acids through beta-oxidation.
Rough Endoplasmic Reticulum
Endoplasmic reticulum is system of membranous tubules and sacs.
Rough ER is covered by ribsomes.
Rough endoplasmic reticulum is prominent in cells that make large amounts of proteins to be exported from the cell or inserted into the cell membrane.
Smooth Endoplasmic Reticulum
The second type of ER. It isn't covered by ribosomes. It is smooth because of that.
Smooth ER is involved in the synthesis of steroids in gland cells, the regulation of calcium levels in muscle cells, and the breakdown of toxic substances by liver cells.