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Chapter 5, Biology
Membranes. raven, Johnson, mason, logos, singer.
Terms in this set (36)
2 fatty acids and a phosphate group, linked to a three-carbon glycerol molecule.
Spontaneously form bilayers due to hydrophilic heads and hydrophobic tails.
Main component of cell membrane.
Hydrophobic fatty acids- inside
Hydrophilic phosphate groups- outside
sheets. of phospholipd bilayers with associated proteins
Consists of 4 component groups:
- Phospholipid bilayer
- Transmembrane proteins (integral membrane proteins)
- Interior protein network
- Cell surface markers
A collection of proteins that float in the lipid bilayer.
Made up of carriers, channels, and receptors that aid in the transportation and communication of molecules across the cell
Interior Protein Network
Determines the shape of the cell, and anchors certain proteins to specific sites.
Made up of Spectrins and Clathrins.
Cell Surface Markers
"Self" and tissue recognition.
Made up of glycoproteins and glycolipids
Affected by unsaturated fats (more fluid) and temperature
Integral membrane proteins that carry specific substances through the membrane. Very selective.
Located on the interior surface of cell membrane. Help chemical reactions.
Respond to external chemical messages to change conditions inside the cell
Cell-Surface Identity Markers
Allow for "self" and "nonself" identifications, using glycoproteins as ID tags
Cell-to-Cell Adhesion proteins
Glue cells together for temporary or permenent interactions
Attachment to Cytoskeleton
Surface proteins that interact with other cells anchor to the cytoskeleton
Membrane-spanning region composed of hydrophobic amino acids arranged in an alpha helix
When substances move in and out of the cell without using energy.
A form of passive transport in which molecules move from a high concentration to a low concentration
Diffusion occurring with the help of membrane proteins, channel or carrier
Allow diffusion of ions based on concentration and charge. Specific for different ions.
Bind to the molecules they transport. the rate of transport is limited by the number of carriers.
The movement of water across the membrane
The concentration of all solutes in a solution. Can be Hypertonic, Hypotonic, or Isotonic
Higher concentration of solutes. Loses water.
Lower concentration of solutes. Gains water.
in osmotic balance
Water channels that facilitate diffusion of water
The force needed to stop osmotic flow
The pumping of ions/molecules across a membrane using energy supplied by ATP.
Lower to higher concentration
Transport a specific molecule in one direction
Transport two molecules in the same direction
Transport two molecules in opposite directions
Uses ATP indirectly. Occurs when energy released by a diffusing molecule is used to transport a different molecule against concentration gradient in the SAME direction
Occurs when energy released by a diffusing molecule is used to transport a different molecule against concentration gradient in a DIFFERENT direction
Moves large quantities of substances that cannot pass through the cell membrane
Involves endocytosis and exocytosis
Bulk materials enter the cell in vesicles
Entering the cell. Cell membrane surrounds material and pinches off to form vesicle
Exiting the cell. Material in a vesicle is discharged when vesicle fuses with membrane
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