Multiple Choice
The plasma membrane is made up of phospholipids and which of the following?
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2. Cell Chemistry & Cell Components
Biological Membranes
Multiple Choice
Which of the following is one of the main functions of the membrane's phospholipid bilayer?
A
To synthesize proteins for the cell
B
To provide a rigid structure to the cell
C
To generate energy for cellular processes
D
To facilitate the transport of substances across the membrane
Verified step by step guidance1
Understand the structure of the phospholipid bilayer: The cell membrane is primarily composed of a double layer of phospholipids, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails facing inward.
Recognize the role of the phospholipid bilayer: The bilayer serves as a selective barrier, allowing certain substances to pass while blocking others, thus facilitating transport across the membrane.
Identify the types of transport: The phospholipid bilayer enables passive transport (such as diffusion and osmosis) and active transport (requiring energy) of substances like ions, nutrients, and waste products.
Differentiate from other cellular functions: While the bilayer is crucial for transport, protein synthesis occurs in ribosomes, and energy generation is primarily a function of mitochondria, not the membrane itself.
Conclude the main function: The primary function of the phospholipid bilayer is to facilitate the transport of substances across the membrane, maintaining homeostasis within the cell.
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