Which of the following is a principle of the fluid mosaic model of the plasma membrane structure?
The lipid bilayer is a solid at body temperature, thus protecting the cell.
All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains.
The Correct Answer is C
A. The lipid bilayer is a solid at body temperature, thus protecting the cell: The lipid bilayer is not solid at body temperature; it is fluid, allowing lateral movement of lipids and proteins, which is essential for membrane flexibility and function.
B. All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell: Membrane proteins are not restricted to the outer surface. They can be integral, spanning the membrane, or peripheral, attached to either the inner or outer surface, participating in transport, signaling, and structural support.
C. Phospholipids form a bilayer that is largely impermeable to water-soluble molecules: The phospholipid bilayer acts as a barrier to most polar and charged molecules while allowing nonpolar molecules to diffuse through. This selective permeability is a core principle of the fluid mosaic model.
D. Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains: Phospholipids have a polar head and two, not three, nonpolar fatty acid tails. This structure creates the amphipathic nature of the membrane, contributing to the bilayer formation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Spinal cord: The spinal cord is housed within the vertebral cavity, which is part of the dorsal cavity. It is protected by the vertebrae and surrounded by cerebrospinal fluid.
B. Thoracic cavity: The thoracic cavity is part of the ventral cavity, not the dorsal cavity. It contains the heart and lungs and is separated from the abdominal cavity by the diaphragm.
C. Vertebral cavity: The vertebral cavity encloses the spinal cord and is a key subdivision of the dorsal cavity, providing protection and structural support.
D. Cranial cavity: The cranial cavity contains the brain and is located within the skull. It is a major component of the dorsal cavity, working with the vertebral cavity to protect the central nervous system.
Correct Answer is B
Explanation
A. Serving as the site for ribosomal RNA synthesis: Ribosomal RNA is synthesized in the nucleolus, not the centrioles.
B. Forming the basis of cilia and flagella: Centrioles are cylindrical structures that organize microtubules and serve as basal bodies for the formation of cilia and flagella, which are essential for cell movement and fluid transport.
C. Providing a whiplike beating motion to move substances along cell surfaces: The beating motion of cilia and flagella is powered by motor proteins and microtubule interactions, not directly by centrioles.
D. Producing ATP: ATP production occurs in mitochondria, not in centrioles, which are structural and organizing components of the cell.
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