The phospholipid bilayer is critically important to the separation of the internal and external environment...
BIOLOGY
SAT 2021
The phospholipid bilayer is critically important to the separation of the internal and external environment of the cell. What drives the formation of the phospholipid bilayer?
- A. None of these
- B. The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophobic head groups to form the outer layer.
- C. The external environment pushes non-polar hydrophilic fatty acid tails to form the inner layer and the polar hydrophobic head groups to form the outer layer.
- D. The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophilic head groups to form the outer layer.
Correct Answer: D. The external environment pushes non-polar hydrophobic fatty acid tails to form the inner layer and the polar hydrophilic head groups to form the outer layer.
Explanation
The external hydrophilic environment attracts polar hydrophilic phosphate head groups to the exterior, while allowing non-polar hydrophobic fatty acids to remain shielded in the interior of what becomes the phospholipid bilayer.
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