Multiple Choice
Which of the following molecules is able to increase the rigidity and decrease the flexibility of a membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, which structure is most directly responsible for maintaining cellular homeostasis by regulating what enters and leaves the cell?
A
Plasma (cell) membrane
B
Cell wall
C
Cytoskeleton
D
Nuclear envelope
Verified step by step guidance1
Understand the concept of cellular homeostasis, which refers to the maintenance of a stable internal environment within the cell despite changes outside the cell.
Recall that the lipid bilayer forms the basic structure of the plasma (cell) membrane, which acts as a selective barrier controlling the movement of substances in and out of the cell.
Recognize that the plasma membrane contains proteins and other molecules that regulate transport, signaling, and communication, making it directly responsible for maintaining homeostasis.
Differentiate the plasma membrane from other structures: the cell wall provides structural support but does not regulate transport; the cytoskeleton maintains cell shape and organization; the nuclear envelope encloses the nucleus but does not control overall cellular exchange.
Conclude that the plasma (cell) membrane is the structure most directly responsible for maintaining cellular homeostasis by regulating what enters and leaves the cell.
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