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Because there is a higher concentration inside the cell then out side ....because it requires energy to move the molecules outside in a different direction then they would normally move, it is like riding a bike up a hill it requires energy.

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Wiki User

13y ago
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Wiki User

11y ago

because transport proteins in the cell membrane "pick up" molecules outside the cell and carry them in by using energy.

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Wiki User

13y ago

Active transport is the movement of molecules from its lower concentration to its higher concentration. Energy is required as it is against diffusion which requires no energy.

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Wiki User

6y ago

Transport proteins use energy to transport substances against their concentration gradient.

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Wiki User

12y ago

no beacause you are a nerd

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Anonymous

Lvl 1
3y ago

because

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Q: Why transport proteins require energy to function in active transport?
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