Organelles are components of a cell to which a function or role can be assigned. Depending on whether the cell is prokaryotic or eukaryotic, the organelle may be different.

Functions of different cell organelles:

• Nucleus: contains all the genetic material, acts as information center and tells all the organelles what to do, RNA transcription.
• Mitochondria: generates energy through respiration
• Endoplasmic recticulum (rough): transport and storage of material; (smooth ER): creation of lipids and fats
• Ribosome: protein creation by RNA translation 
• Golgi apparatus: responsible for synthesis, packing and processing of proteins
• Chloroplast: responsible for glucose creation (by photosynthesis)
• Cytoplasm: is region where all chemical reactions take place
• lysosome: responsible for breakdown of larger molecules
• Flagellum (or flagella): tail like organelle, assists motion
• Vacuole: helps in maintenance of homeostasis
• cell membrane: separates cell from the rest of the environment
• cytoskeleton: supports cell structure

There are a number of other organelles as well.