BIOLOGY 2

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Biology 2

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celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salf solution become limp and soft. From his we can deduce that the cells of the celery stalkhypertonic to fresh water but hypotonic to the salt solution the movement of a substance across a biological membrane against its concentration gradient with the help of energy input isactive transport what kinds of molecules pass through a cell membrane most easilysmall and hydrophobi...

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