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There are 4 molecules racing to get across a typical cell membrane. Contestants: a.C6H12O6, b.CO2, c.Cl- and d.CH3CH2CH2COOH (a fatty acid). Predict the order they'd make it across

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Answer:

b.CO2

d.CH3CH2CH2COOH (a fatty acid)  

c.Cl-

a.C6H12O6

Explanation:

The cell membrane is permeable to gases and fatty acids, as they are non polar and small molecules. Those goes throught the cell membrane with no need of a canal or carrier.

The polar and big molecules needs a canal (as Cl-) or carrier (as C6H12O6) to get the cytoplasma.

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