Organelles are specialized structures that perform various jobs inside cells. The term literally means “little organs.” In the same way organs, such as the heart, liver, stomach, and kidneys, serve specific functions to keep an organism alive, organelles serve specific functions to keep a cell alive.   

Cells are grouped into two different categories, prokaryotic cells and eukaryotic cells, which are primarily differentiated by the presence of one organelle, the nucleus. Prokaryotic cells do not have a nucleus, whereas eukaryotic cells do. A nucleus is a large organelle that stores DNA and serves as the cell’s command center. Single-cell organisms are usually prokaryotic, while multi-cell organisms are usually made of eukaryotic cells.  

Another large organelle found in eukaryotic cells is the mitochondrion, an organelle responsible for making ATP, a chemical that organisms use for energy. Cells often contain hundreds of mitochondria. These mitochondria have an outer membrane, which encases the organelle, and an inner membrane, which folds over several times to create a multi-layered structure known as cristae. The fluid inside the mitochondria is called the matrix, which is filled with proteins and mitochondrial DNA.

Chloroplasts are another organelle that contain a double membrane and retain their own DNA. Unlike mitochondria, however, the inner membrane of chloroplasts is not folded. They do, however have a third, internal membrane called the thylakoid membrane, which is folded. In addition, unlike mitochondria, chloroplasts are only present in plant cells. They are responsible for converting sunlight into energy through a process called photosynthesis.  

Other organelles like lysosomes are responsible for digesting and recycling toxic substances and waste. They are embedded with proteins called enzymes, which break down macromolecules, including amino acids, carbohydrates, and phospholipids. Lysosomes are produced by a larger organelle called the Golgi complex, which manufactures other cellular machinery as well. Whenever a cell dies, it self-destructs using its own lysosomes.  

 

Organelles

Just as organs are separate body parts that perform certain functions in the human body, organelles are microscopic sub-units that perform specific functions within individual cells.

cell
Noun

smallest working part of a living organism.

chloroplast
Noun

part of the cell in plants and other autotrophs that carries out the process of photosynthesis.

cytoplasm
Noun

liquid matrix within a cell

DNA
Noun

(deoxyribonucleic acid) molecule in every living organism that contains specific genetic information on that organism.

lysosome
Noun

organelles that contain hydrolytic enzymes that aid with the digestion of worn out cell parts, food particles, and microorganisms.

mitochondria
Plural Noun

(singular: mitochondrion) structure (organelle) in the cytoplasm of most cells in which nutrients (sugars, fatty acids, and amino acids) are broken down in the presence of oxygen and converted to energy in the form of ATP.

organelle
Noun

specialized part of a cell that performs a specific function.

plasma membrane
Noun

lipid bi-layer embedded with protein molecules, which separates the cell’s internal and external environment.

ribosome
Noun

organelle that produces proteins.