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Question

The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list.

I.    Diffusion - Na+

II.   Active transport - Amino acids

III.  Osmosis - Water

IV.  Facilitated diffusion - Glucose



A

III only

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B

II and IV 

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C

II, III and IV only

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D

I, II, III and IV

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Solution

The correct option is A

III only


Osmosis is the movement of water molecules from high chemical potential to low chemical potential (water potential) along the concentration gradient, but Na+ moves actively. Amino acids and glucose move through facilitated diffusion.


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