Inside each organism is a compartment where all genetic material is stored and where cell functions are regulated. In eukaryotes, this function is assumed by the nucleus, while in prokaryotes the same is assumed by the nucleus.
Nucleoid Definition
By definition, a nucleoid is a component within a prokaryotic cell that contains most or all of the genetic material. This material is called a prokaryotic chromosome.
DNA is found in and in the nucleus. And therefore the functions of nuclei and nucleotides are almost identical. However, their structure and organization are very different.
Nucleus Definition
The nucleus is a visible organ in a eukaryotic cell that is completely enclosed by the nuclear membrane. It contains most of the genes in the cell.
The nucleus is associated with cellular functions, such as growth, metabolism, protein synthesis, and reproduction.
Difference Between Nucleus and Nucleoid
| Nucleus | Nucleoid |
| A nucleus is a membrane-bound structure in which eukaryotes assemble their genetic materials. | Nucleoid is a particular area in which prokaryotes assemble their genetic materials. |
| A nucleus is well-organised and large. | Nucleoid is poorly organised and small. |
| A nucleus is encircled by a double-layer membrane known as a nuclear membrane which separates the nucleus from other organelles. | Nucleoid lacks a protective membrane. |
| A nucleus comprises several chromosomes. | Nucleoid usually contains only one chromosome. |
| A nucleus is a spherically shaped organelle. | Nucleoid is an irregularly shaped area. |
| Nucleoplasm and nucleolus are present in the nucleus. | Nucleoplasm and nucleolus are not found in a nucleoid. |
