Multiple Choice
Why do phospholipids spontaneously form a bilayer when placed in water?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
Which of the following is a function of the cell membrane (lipid bilayer)?
A
Generation of ATP through the citric acid cycle in the cytosol
B
Replication of the cell's DNA before cell division
C
Synthesis of proteins by translating mRNA into polypeptides
D
Selective permeability that regulates the movement of substances into and out of the cell
Verified step by step guidance1
Understand that the cell membrane, also known as the lipid bilayer, primarily functions as a selective barrier that controls the entry and exit of substances, maintaining the internal environment of the cell.
Recognize that the generation of ATP through the citric acid cycle occurs inside the mitochondria, not at the cell membrane, and the citric acid cycle itself takes place in the mitochondrial matrix, not the cytosol.
Know that DNA replication happens inside the nucleus (in eukaryotic cells) before cell division, which is unrelated to the cell membrane's function.
Recall that protein synthesis, involving translation of mRNA into polypeptides, occurs at ribosomes in the cytoplasm or on the rough endoplasmic reticulum, not at the cell membrane.
Conclude that the correct function of the cell membrane is its selective permeability, which regulates the movement of ions, nutrients, and waste products into and out of the cell, maintaining homeostasis.
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