Scelta multipla
Why does a plasma membrane act as a barrier to the free passage of water-soluble substances?
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2. Cell Chemistry & Cell Components
Biological Membranes
Scelta multipla
Which of the following best describes the structure of the plasma membrane?
A
A double layer of phospholipids with embedded proteins
B
A rigid layer of cellulose and proteins
C
A single layer of lipids with scattered carbohydrates
D
A thick layer of nucleic acids and lipids
Guida verificata passo dopo passo1
Understand that the plasma membrane, also known as the cell membrane, is a crucial component of all cells, providing structure and regulating the movement of substances in and out of the cell.
Recognize that the plasma membrane is primarily composed of a phospholipid bilayer. This means it has two layers of phospholipids, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails facing inward.
Identify that embedded within this phospholipid bilayer are various proteins that serve multiple functions, such as transport, signaling, and structural support.
Note that the plasma membrane is not rigid; it is fluid and flexible, allowing for the movement of proteins and lipids within the layer, which is essential for its function.
Conclude that the correct description of the plasma membrane is 'A double layer of phospholipids with embedded proteins,' as this accurately reflects its structure and composition.
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