- Cellular compartmentalization: Eukaryotic cells are compartmentalized into organelles, which are membrane-bound structures that carry out specific functions. Some of the main organelles include the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, and lysosomes.
- Membrane-bound nucleus: The nucleus is a membrane-bound organelle that contains the cell's genetic material (DNA). The DNA is organized into chromosomes, which are structures that help to maintain the integrity of the genetic material during cell division.
- Endomembrane system: The endomembrane system is a network of membranes that are involved in the transport of materials within the cell. The endomembrane system includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, and lysosomes.
- Cytoskeleton: The cytoskeleton is a network of protein filaments that provide structural support for the cell and help to organize the cell's activities. The cytoskeleton also plays a role in cell division and movement.
- Ribosomes: Ribosomes are protein complexes that are responsible for protein synthesis. Ribosomes are found in the cytoplasm and on the surface of the endoplasmic reticulum.
- Mitochondria: Mitochondria are membrane-bound organelles that generate adenosine triphosphate (ATP), the cell's main energy currency. Mitochondria are also involved in other cellular processes, such as apoptosis, calcium homeostasis, and reactive oxygen species (ROS) production.
- Chloroplasts: Chloroplasts are membrane-bound organelles that contain chlorophyll, a green pigment that absorbs light energy from the sun. Chloroplasts use light energy to convert carbon dioxide and water into glucose, a sugar that the cell can use for energy.
- Flagella and cilia: Flagella and cilia are whip-like structures that are used for locomotion. Flagella are typically much longer than cilia and are found on only one or two cells, while cilia are shorter and are found on many cells.
Eukaryotes are a diverse group of organisms that includes animals, plants, fungi, and protists. They are found in all environments on Earth, from the depths of the ocean to the tops of mountains.
