Phospholidpid Bilayer Flashcards
(12 cards)
Purpose
• Separate cells interior and exterior environment
• allows things to enter and leave cell
What’s allowed in?
Molecule of a certain solubility and size, as well as the proteins channels
Structure
It’s two phospholipids that are together via legs to legs
Fluidity
Phospholipids are fluid and can move laterally, as well as protein. They are not static
What is the cell membrane composed of
It’s composed of different macromolecules— mosaic like
What role does the hydrophobic tails have
Since they are hydrophobic, they prevent water molecules and other polar molecules out
The purpose of cholesterol in the cell membrane
Regulates fluidity when temp changes
Hot: cholesterol keeps membrane close together
Low: to prevent freezing, cholesterol keeps legs separated
Integal proteins
A protein that is permanently present in the membrane, that cross the entire membrane
Ex. Insulin receptors, ion channels
Peripheral protein
A temporary protein present in the membrane, that attaches to the integral protein or the membrane
Ex. Cytochrome C
The purpose of protein in the membrane (T E A S)
Transport: move molecules across the membrane
Enzyme activity: activates enzyme activity
Signaling: detect and respond to external signals
Attachment and recognition: help anchor the cytoskeleton to the membrane for support
TENS
Glycoproteins
A protein with a carbohydrate chain attached onto it
• protein end is anchored to the membrane, while the carb chain is facing the extracellular surface (outside)
For structural support, and cell recognition and interaction
Glycolipids
A lipid that has a carbohydrates chains attached to it
Lipid end is anchored to the membrane, while the carb chain is facing the extracellular surface (outside)
For cell recognition and interaction
