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GCSE Biology · key term
The long, whip-like part of a sperm cell that propels it towards an egg.
Used by AQA and Edexcel
Specification 4.1.1.3 · Paper 1
Revise: Cell SpecialisationA sperm cell must reach and fertilise an egg. Its long flagellum moves it through fluid, while numerous mitochondria release energy by respiration for that movement. Its streamlined shape helps it swim.
Specification 1.1 · Paper 1, Paper 2
A tail-like structure that enables some bacterial cells to move.
Use plurals accurately: one mitochondrion, several mitochondria; one flagellum, several flagella.
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A flagellum moves to propel the cell, allowing the bacterium to travel through a liquid environment. This can help it reach favourable conditions, but flagella are not present in all bacteria.