Which of the following does NOT require ATP? (A) Facilitated diffusion (B) Activation of the con

step 1 Which of these processes does not require ATP? Is it facilitated diffusion? Activation of a cont

Which of the following does NOT require ATP? (A) Facilitated...

Key Concepts

Passive Transport

Passive transport is the movement of substances across a cell membrane without the need for additional energy input. This includes mechanisms where the movement is driven solely by concentration gradients, meaning particles move from regions of higher concentration to lower concentration naturally.

Facilitated Diffusion

Facilitated diffusion is a subtype of passive transport where molecules traverse the cellular membrane with the help of specialized transmembrane proteins. It does not require ATP because particles still move down their concentration gradient, but the process is aided by protein channels or carriers that allow larger or polar molecules to pass through the lipid bilayer.

Active Transport

Active transport involves the movement of molecules against their concentration gradient, from areas of lower concentration to higher concentration. This process requires energy, typically provided by ATP, to power the molecular pumps or carriers that facilitate the movement against the natural diffusion gradient.

Endocytosis

Endocytosis is a cellular process in which cells engulf external material, incorporating it into vesicles formed by the inward folding of the plasma membrane. This mechanism is energy-dependent, generally requiring ATP to drive the membrane rearrangements and vesicle formation.

ATP (Adenosine Triphosphate)

ATP is the primary energy currency of the cell, supplying the necessary energy to drive energy-demanding processes such as active transport and various forms of endocytosis. Its hydrolysis releases energy that powers cellular functions and biochemical reactions.

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