Asked by Eli
what is a cytoplasm
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The cytoplasm is the interior of a cell outside the nucleus (in eukaryotes) that contains the cell’s organelles, structures, and the fluid in which they float.
Key points:
- Composition: it consists of the cytosol (the gel-like, aqueous solution of water, ions, small molecules and soluble proteins), membrane-bound and non‑membrane-bound organelles (e.g., mitochondria, endoplasmic reticulum in eukaryotes), ribosomes, the cytoskeleton, and various inclusions (stored nutrients, pigments).
- Function: it suspends and supports organelles, is the site of many metabolic reactions (for example glycolysis and parts of protein synthesis), enables intracellular transport and signaling, and contributes to cell shape and motility (via the cytoskeleton and cytoplasmic streaming).
- Prokaryotes vs. eukaryotes: in prokaryotes (no nucleus) the cytoplasm contains the DNA and all cellular machinery; in eukaryotes the cytoplasm surrounds but does not include the nucleus.
- Terminology: “cytosol” refers specifically to the soluble fluid portion; “cytoplasm” usually means the cytosol plus all the organelles and structures inside the cell membrane (except the nucleus).
In short: the cytoplasm is the living, gel‑like interior of a cell where much of the cell’s chemistry and structural organization takes place.
Key points:
- Composition: it consists of the cytosol (the gel-like, aqueous solution of water, ions, small molecules and soluble proteins), membrane-bound and non‑membrane-bound organelles (e.g., mitochondria, endoplasmic reticulum in eukaryotes), ribosomes, the cytoskeleton, and various inclusions (stored nutrients, pigments).
- Function: it suspends and supports organelles, is the site of many metabolic reactions (for example glycolysis and parts of protein synthesis), enables intracellular transport and signaling, and contributes to cell shape and motility (via the cytoskeleton and cytoplasmic streaming).
- Prokaryotes vs. eukaryotes: in prokaryotes (no nucleus) the cytoplasm contains the DNA and all cellular machinery; in eukaryotes the cytoplasm surrounds but does not include the nucleus.
- Terminology: “cytosol” refers specifically to the soluble fluid portion; “cytoplasm” usually means the cytosol plus all the organelles and structures inside the cell membrane (except the nucleus).
In short: the cytoplasm is the living, gel‑like interior of a cell where much of the cell’s chemistry and structural organization takes place.
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