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Schematic diagram showing mitochondria, complex organelles that convert energy from food into a form that the cell can use.

(genetic biology)

Grammar: noun
plural: organelles
Definition: a specialised structure within a cell, such as a mitochondrion, a vacuole, or a chloroplast, that performs a specific function
Example:
1. Cell membranes are important in localizing biochemical reactions within organelles.

2. Eukaryotes, which have large amounts of DNA per cell, need specialised sub-cellular organelles (nuclei) to contain their DNA.