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Which best describes why active transport requires atp to move molecules across the cell membrane?




A. Molecules are moved with the concentration gradient

B. Molecules are moved against the concentration gradient

C. No net movement of molecules needs to occur

Respuesta :

ackahedem582

Answer:

B. Molecules are moved against the concentration gradient.

Explanation:

Due to the higher concentration of the molecules of one of the sides than the other,in order to move molecules from the side with higher concentration of molecules to the side of lower concentration of molecules which is against the movement of molecules across the membrane, energy must be applied i.e atp.

samueladesida43

The reason active transport requires ATP to move molecules across the cell membrane is because molecules are moved against the concentration gradient.

ACTIVE TRANSPORT:

  • Active transport is a type of cellular transport that requires the input of energy in form of ATP. Examples of active transport are pumping of Na+/K+ ions, exocytosis etc.

  • Active transport requires ATP because molecules are being moved against concentration gradient. This means that molecules are moved from regions of low concentration to that of high concentration.

  • Passive transport, which does not require energy, moves molecules down a concentration gradient.

  • Therefore, the reason active transport requires ATP to move molecules across the cell membrane is because molecules are moved against the concentration gradient.

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