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Home Q & A Board Biology-Related Homework Help General Biology
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roxana90 roxana90
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13 years ago
The cells that line the small intestine can absorb glucose even though the concentration
inside the cell already exceeds the concentration outside of the cell (in the lumen of the
intestine). The protein that transports this glucose into the cell also, at the same time,
brings in a Na+ ion. If this happens, what do you know about the delta-G for the transfer
of Na+ into the cell and the delta-G for the transport of glucose into the cell?
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#1
13 years ago
The movement of any molecule or ion down - or up - a concentration gradient involves a change in free energy, delta-G

- down releases energy so delta-G is negative
- up consumes energy so delta-G is positive
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