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Module 4B Quiz

BiologyCellFunction

TermDefinition
Fluid Mosaic Model Proposes that the plasma membrane is composed of a mosaic of components (mainly phospholipids, proteins, and cholesterol) that are free to move fluidly within the plane of the membrane
Phospholipids a fatty acid molecule in the lipid is replaced by the hydrophilic phosphate group
Semipermeable membrane A membrane that allows some molecules to pass through but does not allow other molecules to pass through.
Passive Transport movement of molecules through the plasma membrane without the need for energy input
Active Transport Movement of molecules through the plasma membrane aided by a process that requires energy.
Concentration how much solute exists within a certain volume of solvent
Diffusion the random motion of molecules from an area of high concentration to an area of low concentration until equal
Osmosis diffusion through a membrane
Hypotonic Solution Low solute concentration (lots of water) compared to another place
Hypertonic Solution high solute concentration (little water) compared to another place
Isotonic Solution when two solutions have the same concentration
Plasmolysis A plant cell's cytoplasm collapsing due to water rushing out into hypertonic solution
Cytolysis A cell bursts and dies from too much water rushing in
Facilitated Diffusion Channel proteins moving certain molecules across the membrane according to their gradient
Endocytosis Moving particles INTO the cell by making a vesicle out of the cell membrane
Exocytosis Moving particles OUT of the cell by fusing a vesicle with the cell membrane
Phagocytosis Cell eating: cells engulfing large solid particles or other cells
Pinocytosis Cell drinking: cells taking in extracellular fluid
Concentration Gradient the difference in concentration of like molecules in two areas, like on each side of a plasma membrane
Examples of Passive Transport Diffusion, Osmosis, Facilitated Diffusion
Examples of Active Transport Endocytosis, Exocytosis, Pinocytosis
Created by: AMDeal
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