1. Membrane-Bound Organelles:
* Nucleus: Contains the cell's DNA, which is organized into chromosomes.
* Endoplasmic Reticulum (ER): A network of membranes involved in protein synthesis, folding, and transport.
* Golgi Apparatus: Processes and packages proteins and lipids.
* Mitochondria: Powerhouses of the cell, responsible for ATP production through cellular respiration.
* Lysosomes: Contain enzymes for breaking down waste materials and cellular debris.
* Peroxisomes: Break down fatty acids and detoxify harmful substances.
* Vacuoles: Storage compartments for water, nutrients, and waste.
2. Cytoskeleton:
* A network of protein filaments (microtubules, microfilaments, intermediate filaments) that provides structural support, allows movement, and facilitates transport within the cell.
3. Larger Size:
* Eukaryotic cells are generally much larger than prokaryotic cells, ranging from 10-100 micrometers in diameter. This allows for greater complexity and specialization.
4. Linear DNA:
* Eukaryotic DNA is organized into linear chromosomes within the nucleus, while prokaryotic DNA is circular and located in a region called the nucleoid.
5. Sexual Reproduction:
* Eukaryotes reproduce sexually, involving the fusion of gametes (sperm and egg) to form a zygote. Prokaryotes primarily reproduce asexually, though some can exchange genetic material through horizontal gene transfer.
6. More Complex Cell Wall Structure:
* While some eukaryotic cells have cell walls (e.g., plants, fungi), they are more complex in structure compared to the simple cell walls found in prokaryotes.
7. Introns:
* Eukaryotic genes contain non-coding regions called introns, which are spliced out before protein synthesis. Prokaryotic genes generally lack introns.
This table summarizes the key differences:
| Feature | Eukaryotic Cells | Prokaryotic Cells |
|---|---|---|
| Nucleus | Present | Absent |
| Membrane-bound organelles | Present | Absent |
| Cytoskeleton | Present | Absent |
| DNA | Linear chromosomes | Circular DNA (nucleoid) |
| Size | Larger (10-100 µm) | Smaller (1-10 µm) |
| Reproduction | Sexual and asexual | Primarily asexual |
| Cell wall | More complex (in some) | Simple |
| Introns | Present in genes | Generally absent |
These fundamental differences in structure and function allow eukaryotic cells to achieve a level of complexity and specialization that is not possible for prokaryotic cells.
