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

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.

the answer is d. 74.02