18 Questions
What is the primary function of membrane proteins?
All of the above
Which of the following statements about peripheral membrane proteins is true?
They are attached to the membrane by weak noncovalent bonds
What is the function of aquaporins?
To transport water molecules across the cell membrane
What is the glycocalyx?
A coating of glycoproteins and glycolipids on the outer surface of the plasma membrane
What is the primary function of the glycocalyx?
All of the above
What does the electron microscopy image show?
The plasma membrane of a microvilli from a lining cell of the small intestine
Which of the following statements about cell membranes is correct?
Cell membranes are composed of approximately equal amounts of lipids and proteins.
What is the primary function of the lipid bilayer in cell membranes?
To separate the interior of the cell from the external environment and internal compartments.
Which of the following is a property of phospholipid molecules in cell membranes?
They are amphiphilic, with a polar head and a non-polar tail.
What is the primary function of proteins embedded within the lipid bilayer of cell membranes?
To facilitate the passage of specific ions and molecules.
Which of the following statements about the chemical reactions in cells is correct?
Most chemical reactions in cells take place in aqueous polarized solutions.
What is the primary role of membrane proteins in cell signaling?
They mediate cell signaling processes.
Which of the following is NOT a component of the plasma membrane?
Ribosomes
What is the primary function of the nucleus?
To contain the cell's genetic material
Which organelle is responsible for producing energy in metabolically active cells?
Mitochondria
Which of the following is a characteristic of prokaryotic cells?
Absence of membrane-bound organelles
Which organelle is responsible for protein synthesis in eukaryotic cells?
Ribosomes
What is the process by which cells become specialized for specific functions?
Cell differentiation
Test your knowledge on membrane proteins and their vital functions in cell-cell adhesion, cell-matrix adhesion, intercellular signaling, and material transport. Learn about how transmembrane proteins form channels for the movement of substances across the cell membrane.
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