Multiple Choice
The phospholipid molecules of most biological membranes have:
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6. The Membrane
Biological Membranes
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Which of the following is a primary function of the biological membrane in eukaryotic cells?
A
Producing ATP through cellular respiration
B
Storing genetic information
C
Synthesizing proteins for cellular use
D
Regulating the movement of substances into and out of the cell
Verified step by step guidance1
Understand the role of biological membranes in eukaryotic cells. Biological membranes, such as the plasma membrane, are primarily responsible for maintaining homeostasis by controlling the movement of substances into and out of the cell.
Recall the structure of the biological membrane. It is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates, which contribute to its selective permeability.
Differentiate the primary function of the biological membrane from other cellular processes. For example, ATP production occurs in mitochondria, genetic information is stored in the nucleus, and protein synthesis occurs in ribosomes. These are distinct functions from the membrane's role.
Focus on the concept of selective permeability. The biological membrane regulates the movement of substances such as ions, nutrients, and waste products through mechanisms like passive diffusion, facilitated diffusion, and active transport.
Conclude that the correct answer is regulating the movement of substances into and out of the cell, as this is the primary function of the biological membrane in eukaryotic cells.
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