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Chapter 7 - Membrane
Campbell Biology
14
Biology
Undergraduate 1
12/08/2014

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Term
The plasma membrane exhibits ________, allowing some substances to cross it more easily than others
Definition
selective permeability
Term
Phospholipids are ___________ molecules, containing hydrophobic and hydrophilic regions
Definition
amphipathic
Term
_______ proteins are bound to the surface of the membrane
Definition
Peripheral
Term
________ penetrate the hydrophobic core
Definition
Integral proteins
Term
Six major functions of membrane proteins
Definition
Transport
Enzymatic activity
Signal transaction
Cell-cell recognition
Inter-cellular joining
Attachment to the cytoskeleton and extracellular matrix (ECM)
Term
________ allow passage of hydrophilic substances across the membrane
Definition
Transport proteins
Term
Channel proteins called _________ facilitate the passage of water
Definition
aquaporins
Term
_______ ability of a surrounding solution to cause a cell to gain or lose water
Definition
Tonicity
Term
_____ solution --> Solute concentration > than inside the cell; cell loses water
Definition
Hypertonic
Term
_____ solution --> Solute concentration < than inside the cell; cell gains water
Definition
Hypotonic
Term
Membrane ____ is the voltage difference across a membrane
Definition
potential
Term
In _____, molecules dissolved in droplets are taken up when extracellular fluid is “gulped” into tiny vesicles
Definition
pinocytosis
Term
The plasma membrane exhibits ______ ______, allowing some substances to cross it more easily than others
Definition
selective permeability
Term
Phospholipids are ________ molecules, containing hydrophobic and hydrophilic regions
Definition
amphipathic
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