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Why do the passenger molecules need to be helped by the carrier molecule? (carrier molecule being the molecule in a cell that helps a normal molecule (passenger molecule) inside the cell).
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Why do the passenger molecules need to be helped by the carrier molecule? (carrier molecule being the molecule in a cell that helps a normal molecule (passenger molecule) inside the cell).

User Haris Ali Khan
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Some molecules can't go through the cell membrane.
User Casterle
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Some molecules can't pass alone and they need help because they can't pass through the cell membrane without help
User Architect
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