16 Questions
Which of the following is NOT a factor that determines the permeability of the cell membrane?
Amount of cholesterol in the lipid bilayer
What is the approximate percentage of proteins in the lipid bilayer of the cell membrane?
55%
Which type of protein has tight attachment and spans the entire cell membrane?
Integral Proteins
What is the main role of cholesterol in the cell membrane?
Confers membrane fluidity and permeability to water-soluble substances
Which category of lipids confer antigenicity in the cell membrane?
Glycolipids
What type of interactions are responsible for the tight attachment of integral proteins to the cell membrane?
Hydrophobic interactions
What type of transport involves the movement of solvent from low to high solute concentration?
Osmosis
What type of solution has the same concentration of solutes both inside and outside the cell?
Isotonic Solution
Which type of endocytosis involves the cell engulfs drops of fluid by pinching in and forming vesicles?
Pinocytosis
What is the source of energy for primary active transport?
ATP hydrolysis
Which type of substance undergoes simple diffusion across the cell membrane?
Lipid-Soluble (Non-polar, Hydrophobic) Substances
What type of transport exhibits co-transport and countertransport?
Primary Active Transport
Which characteristic of carrier-mediated transport refers to the finite number of carriers?
Saturation
Which solution has a higher solute concentration outside the cell than inside?
Hypertonic Solution
What is the process by which materials move into the cell?
Endocytosis
What type of endocytosis is extremely selective and involves receptor-mediated binding?
Receptor-mediated endocytosis
This supplemental handout covers the structure and function of the cell membrane, emphasizing its role as the guardian of the cell and its composition of lipids, proteins, and carbohydrates. It also discusses the fluid-mosaic model and the semipermeable nature of the membrane.
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