non-membrane-bounded organelle

Definition

Target type: cellularcomponent

Organized structure of distinctive morphology and function, not bounded by a lipid bilayer membrane. Includes ribosomes, the cytoskeleton and chromosomes. [GOC:go_curators]

Non-membrane-bounded organelles are cellular structures that lack a surrounding lipid bilayer membrane. These organelles are essential for a wide range of cellular processes, including protein synthesis, gene expression, and energy production.

Key characteristics of non-membrane-bounded organelles include:

- **Absence of a membrane**: This distinguishes them from membrane-bound organelles like the nucleus, mitochondria, and endoplasmic reticulum.
- **Association with other structures**: Often, these organelles are associated with other cellular components, such as the cytoskeleton or the nuclear matrix.
- **Specific functions**: Each type of non-membrane-bounded organelle has a distinct and essential role in the cell's functioning.

Examples of non-membrane-bounded organelles include:

- **Ribosomes**: These are responsible for protein synthesis, translating the genetic code from messenger RNA into amino acid chains.
- **Nucleolus**: This structure within the nucleus is the site of ribosome biogenesis.
- **Centrioles**: These cylindrical structures are involved in cell division, organizing microtubules for spindle formation.
- **Proteasomes**: These are protein complexes that degrade damaged or unnecessary proteins.
- **Centromeres**: These regions on chromosomes serve as attachment points for microtubules during cell division.

The lack of a membrane allows these organelles to interact directly with the surrounding cytoplasm and other cellular components, facilitating their specific roles in cellular processes.'
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Proteins (1)

Compounds (22)