Multiple Choice
In a typical cell membrane lipid bilayer, how are phospholipids arranged?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In an animal cell, where is the cell (plasma) membrane located?
A
It is located inside mitochondria as the inner mitochondrial membrane, where oxidative phosphorylation occurs.
B
It surrounds the nucleus, separating nucleoplasm from cytoplasm.
C
It lines the interior of the endoplasmic reticulum, enclosing the ER lumen.
D
It surrounds the cell, forming the outer boundary between the cytoplasm and the extracellular environment.
Verified step by step guidance1
Step 1: Understand the structure of an animal cell and identify the main compartments: the nucleus, cytoplasm, mitochondria, endoplasmic reticulum (ER), and the cell membrane.
Step 2: Recall that the cell (plasma) membrane is a lipid bilayer that forms the outer boundary of the cell, separating the internal contents (cytoplasm) from the external environment.
Step 3: Differentiate the cell membrane from internal membranes such as the inner mitochondrial membrane (which is inside mitochondria and involved in energy production), the nuclear envelope (which surrounds the nucleus), and the ER membrane (which encloses the ER lumen).
Step 4: Recognize that the cell membrane is not located inside organelles but rather surrounds the entire cell, controlling the movement of substances in and out of the cell.
Step 5: Conclude that the correct location of the cell (plasma) membrane is as the outer boundary of the cell, separating the cytoplasm from the extracellular environment.
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