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Specialist cells: structure and function

Cell biology • Cell structure

Key concepts

What you'll likely be quizzed about

  • Cells develop specialized features that enhance efficiency in performing particular tasks.
  • For example, a larger surface area accelerates absorption or secretion, while a higher abundance of organelles, such as mitochondria, boosts ATP production, ensuring energy-demanding processes proceed effectively.
  • Additionally, some specialized cells may lose certain organelles, like the nucleus, to increase capacity for transport or storage, thereby refining their primary functions.

Flashcards

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What keeps plant cells turgid?

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A fully filled central vacuole exerts pressure against the cell wall, creating turgor pressure that maintains cell rigidity.

Key notes

Important points to keep in mind

Link structural features to their corresponding functional outcomes using clear cause and effect language.

More mitochondria → increased ATP production → supports high-energy processes.

Increased surface area → enhanced exchange rates → faster absorption or secretion (e.g., root hair cells).

Loss of cell contents (as in xylem) → reduced resistance to water flow → efficient long-distance transport.

Reduced organelles in phloem → lower sap flow resistance; companion cells meet metabolic needs.

Differentiation usually is reversible in plants, but mainly irreversible in mature animals; stem cells support limited regeneration in mammals.

Identify limiting factors affecting adaptations (like nutrient levels or oxygen availability).

Employ accurate terminology: axon, myelin sheath, flagellum, mitochondrion, sieve plate, lignin, vacuole.

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