Question
Asked Oct 2, 2019
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Choose which substances cannot pass through the phospholipid bilayer of the plasma membrane. 

A. Gasses

B. Charged molecules 

C. Hydrophobic molecules 

D. Lions

E. Water

F. ATP

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Expert Answer

Step 1

Phospholipids:

These are a type of lipids. A phospholipid molecule structure usually contains two hydrophobic fatty acid tails and a hydrophilic head comprising of a phosphate group.

Cell membrane:

The membrane is complex in structure as it is composed of a phospholipid bi-layer with different types of proteins.

Step 2

Cell membrane is selectively permeable in nature and regulates the entry and exit of substances from inside to outside the cell or vice a versa.

Small and non-polar molecules including gases like O2 and CO2, are usually soluble in the lipid bilayer. Therefore, they can readily pass through the cell membranes. Small uncharged polar molecules (like H2O) can diffuse through the phospholipid of cell membranes. The hydrophobic molecule has no charge and can easily pass through the phospholipid membrane.

Step 3

The substances that cannot bypass through the phospholipid bilayer of the plasma membrane are charged molecules, ions, and ATP. 

Thus, the correct options are:

B). Charged molecules:

As the phospholipid is polar thus it can pull towards a charged molecule. This leads to the difficulty in the passage of a charged molecule through the phospholipid of the cell m...

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